October 6, 2017 marked the hundredth anniversary of the Trading with the Enemy Act. What began as an effort to “define, regulate, and punish trading with the enemy” in the context of a congressionally declared war of limited duration has transformed over the decades into a broad writ of executive authority to wage economic warfare against loosely defined enemies virtually anywhere and at any time.Footnote ¹

Tracing this history sheds light on what might be called the secret life of statutes: the way that laws survive beyond their initial moment of creation, to be revived, reworked, and redeployed in later times of need. Over time, through executive proclamations, congressional amendments, and judicial decisions, the Trading with the Enemy Act concentrated more and more power in the hands of the president. By the 1950s, it served as the legal underpinning of most of the nation's highest-profile economic sanctions regimes—a function that it and its legislative offspring continue to perform. The law has granted presidents the unilateral authority to interfere with private economic transactions—including by freezing assets or imposing trade embargoes—in times of declared emergencies. Though overshadowed by military operations, U.S. economic sanctions have affected the lives of millions of people around the world.Footnote ² The story of the act, then, is part of the story of the rise of American global power, and the legal and government foundations that made possible its exercise.

The Trading with the Enemy Act has drawn the attention of political scientists, lawyers, and economists who have debated the efficacy of sanctions or focused on the law's implications for constitutional interpretation and current policy.Footnote ³ Far less attention has been given to the act's historical contexts and its unexpected outcomes.Footnote ⁴ Historians have chronicled a few of the episodes of heightened activity that have punctuated the history of the Trading with the Enemy Act—moments when the law justified new government actions, including during World War I, when the act allowed the United States to seize German property, and in 1933, when Franklin D. Roosevelt cited it to proclaim a “Bank Holiday.”Footnote ⁵ Some also note that the Trading with the Enemy Act justified freezing Japanese assets and the assets of European countries occupied by the Axis before Pearl Harbor, as well as imposing embargoes against China and North Korea during the Cold War.Footnote ⁶ Little has been written, however, about how Congress's attempts in the 1970s to rein in executive power led to the act's reinvention. Nor have historians considered the long arc of the law and its role in shaping U.S. global hegemony.

A historically grounded overview of the evolution and use of the Trading with the Enemy Act sheds light on how the expansion of U.S. global power reshaped the American state both at home and abroad beginning with World War I.Footnote ⁷ Wars built the modern state, scholars often remind us.Footnote ⁸ Military moments have led not only to larger bureaucracies, increased taxes, and widened state authority, but also to new ways to mobilize citizens to serve as private arms of state power.Footnote ⁹ Unraveling the history of the Trading with the Enemy Act highlights in particular how much the transformation of the modern American state has occurred by means of the stretching of laws during times of perceived crisis.

The Trading with the Enemy Act served as the statutory foundation for the nation's emergence as what might be called a “sanctioning state.” This phrase has a dual meaning. It first denotes a state that frequently uses sanctions as a foreign policy tool. Since 1945 the United States has been the world's leading user of sanctions, imposing them—often unilaterally—against nations and individuals that have expropriated the property of U.S. nationals, violated human rights norms, or challenged American visions of proper conduct in other ways.Footnote ¹⁰ Second, the term “sanctioning state” refers to the legal and bureaucratic state apparatus required to implement and sustain sanctions regimes over months, years, and, in some cases, decades.Footnote ¹¹ The history of the Trading with the Enemy Act illuminates how this apparatus expanded over time to meet the needs of a sanctions-imposing foreign policy.

Because presidents and their lawyers felt it was important to ground policies in legal authority, law was repeatedly called upon to justify such economic warfare policies.Footnote ¹² Not surprisingly then, lawyers were central to shaping the Trading with the Enemy Act's secret life. It lay dormant for long stretches during the twentieth century, but lawyers remembered where it slept and at key moments reminded policymakers of powers it might grant once awakened. Over time, lawyers made the act the keystone in a broader legal infrastructure that permitted the implementation of long-running and wide-ranging sanctions.

In order to impose economic sanctions during peacetime, presidents generally cited the existence of a national emergency. The practice of emergency government has a long history in the United States, including Abraham Lincoln's seizure of virtually dictatorial authority in 1861, Franklin Roosevelt's extensive use of emergency authority during the Great Depression, and Harry Truman's declaration of national emergency in 1950 during the Korean War.Footnote ¹³ From 1976 to 2004, presidents declared another thirty-eight national states of emergency (not including those that responded to domestic natural disasters).Footnote ¹⁴ By the end of 2017, twenty-eight separate declared national emergencies remained in place.Footnote ¹⁵

The aggressive use of national emergencies, most justified under the Trading with the Enemy Act, contributed greatly in the twentieth century to both the expansion of presidential powers and the development of what amounts to a permanent state of war.Footnote ¹⁶ The maintenance of a large standing army, the stationing of troops overseas, the concentration in presidential hands of the practical power to declare and wage war—all of these departed in important ways from the original vision of the nation's founders.Footnote ¹⁷ The story of the Trading with the Enemy Act shows how the creative application of statutes advanced this dramatic transformation, and emphasizes the role of statutes in shifting the practical meaning of the Constitution over time.Footnote ¹⁸ It also highlights how these changes have been produced through political contestation and cooperation between Congress and the executive.Footnote ¹⁹

The basic contours of the debate over emergency rule are little changed since two political scientists staked them out in the 1940s. In 1947, Princeton professor Edward Corwin lamented that the combination of two world wars and the Great Depression had transformed a “Constitution of Rights” that protected individuals into a “Constitution of Powers” that concentrated authority in the national government in general and the executive branch in particular.Footnote ²⁰ Corwin traced the origins of this change to 1917. The modern Constitution of Powers, he claimed, was merely the “Constitution of World War I … adapted to peacetime uses in an era whose primary demand upon government is no longer the protection of rights but the assurance of security.”Footnote ²¹ States of emergency, Corwin suggested, had stripped Americans of their fundamental rights and reduced the republic to a quasi-authoritarian state.

The following year, Clinton Rossiter, Corwin's former graduate student, suggested a different reading. Rossiter argued that the phenomenon of emergency government originated in ancient times. “Constitutional Dictatorship,” he argued, was a necessary and potentially beneficial component of constitutional systems. During times of acute crisis, even democracies needed to arm the government with enhanced powers in order to survive.Footnote ²² While it was important to establish safeguards to protect rights during emergency conditions and to ensure the reestablishment of “normal” rule, republics and emergency government were fundamentally compatible.

Scholarship since 9/11 has resuscitated this older debate.Footnote ²³ Many analysts conclude that emergency powers subvert the rule of law and undermine basic republican and democratic values.Footnote ²⁴ Such works often highlight Italian philosopher Giorgio Agamben's concept of the “state of exception.” Agamben argues that modern states invoke the existence of a state of emergency or “exception” in order to exercise powers previously unavailable to them, including even the power over human life. For Agamben, the exception describes a space where law in practice no longer applies, and which therefore facilitates the untrammeled use of power and violence. This state of exception, Agamben argues, “has continued to function almost without interruption from World War One, through fascism and National Socialism, and up to our own time” and has “today reached its maximum worldwide deployment.”Footnote ²⁵

A second strain of thought sees emergency powers as contained within the constitutional order. To say that emergency powers constitute an exception to the law is to suggest that a “normal” non-exceptional law reigns the rest of the time. Some legal scholars have argued that rather than interpreting emergency powers as the absence of legality, it is better to imagine them as a parallel form of law. In her study of European empires, for instance, Lauren Benton suggests that “[p]ockets of legal anomaly created in empire appear more often as patterned variations of legal ordering than as instances of exception.”Footnote ²⁶ Legal scholar David Kennedy points out that many allegedly “lawless” outposts of the War on Terror are in fact governed by law: “it is simply that different rules apply and different rules do not apply.”Footnote ²⁷ It is possible to cite this basic continuity to condemn the entire modern liberal system: In this critique, both “normal” and “emergency” rule are fundamentally authoritarian.Footnote ²⁸ Others are less critical. Legal scholar Kim Lane Scheppele observes that the United States since World War I has been “virtually always in a state of emergency, one way or another,” but emphasizes that this emergency condition has been “normalized” within the constitutional order.Footnote ²⁹ This is because Congress has given its blessing to the president's emergency authorities, often beforehand (as in World War I) or shortly after (as during the Franklin Roosevelt administration). By delegating its powers to the executive, Congress has arguably undermined the founders’ vision of limited executive power.Footnote ³⁰ But it has done so willingly. And while presidents have twisted and at times tortured the law in search of justification for their actions, they have rarely claimed that emergencies granted them power entirely beyond the reach of Congress or the courts.Footnote ³¹

The history of the Trading with the Enemy Act provides support for this second interpretation. While presidents have taken the lead in imposing sanctions under the act and have done so through the exercise of emergency powers, this is not a story of an “unbound” executive run amok.Footnote ³² Rather it shows a Congress willing to delegate power, and a court system willing to bless this arrangement. Congress passed amendments to the Trading with the Enemy Act that significantly expanded the president's powers in 1917, 1918, 1933, 1940, and 1941, and made few attempts to rein them in afterwards.Footnote ³³ Even during the 1970s, when Congress, in a fit of legislative assertiveness, made an important amendment to the Trading with the Enemy Act, the executive retained nearly all the powers that had initially applied only during wartime. In the process of making, amending, blessing, and wielding the law, all three branches of government have built a more powerful state capable of conducting global economic warfare even during times of peace.Footnote ³⁴ This outcome is quite different from the intentions of the original bill's architects.

In the beginning, the Trading with the Enemy Act had two primary functions: to prevent Germany from mobilizing American resources and to “conscript” German property for the benefit of the U.S. war effort.Footnote ³⁵ The latter entailed seizing “enemy” funds—“enemy” referring to anyone living in the territory of the Central Powers, including American heiresses who had the misfortune of marrying Austro-Hungarian nobles—and investing them in U.S. liberty bonds.Footnote ³⁶ The act also allowed U.S. firms to license German chemical patents—no small thing in an age when German firms dominated synthetic chemistry.Footnote ³⁷ The patent for Salvarsan, then the most effective treatment for syphilis, was especially important considering the combination of war-induced pharmaceutical shortages and U.S. government fears about the sexual behavior of its new soldiers.Footnote ³⁸

Opponents of the Trading with the Enemy Act complained that seizing such funds and assets violated basic property rights. They fretted about possible repercussions for postwar investment in the United States. “[W]e shall in the future, as in the past, probably be applicants for the investment of foreign funds,” noted Representative Ebenezer J. Hill (R-CT). “What position are we going to be in if we confiscate the stocks and bonds owned abroad?”Footnote ³⁹ But the bill's backers pointed out that sequestering enemy property during wartime followed Britain's lead and comported with the norms of civilized practice.Footnote ⁴⁰ “[T]he bill recognizes and affirms the interdiction of international law,” asserted Representative Andrew Jackson Montague (D-VA). Because it allowed the president to grant licenses to continue trade, it even “relaxes the scope and rigor of such interdiction.”Footnote ⁴¹ Assistant Attorney General Charles Warren, the bill's main drafter, argued moreover that banning the “actual transfer and transport of commodities” was insufficient in an age when tremendous sums circuited the Atlantic via “transfer of credits and money by letter T cable, or wireless.”Footnote ⁴² Having just emerged as the world's chief financier, the United States had immense economic power.Footnote ⁴³ “This war is to be won as much by dollars as it is by men and guns,” said Rep. John Jacob Esch (R-WI), “and for this reason we are trying in this bill to make it impossible for a dollar of trade or business to inure to the advantage of the enemy.”Footnote ⁴⁴

Governmental seizure of private property for public ends was not as surprising in 1917 as it might have been three decades earlier before social and economic reformers had significantly expanded the role of the state. By the onset of war, laws and executive agencies at the municipal, state, and federal levels regulated business, supervised markets, and provided social insurance.Footnote ⁴⁵ And while the government's formal diplomatic machinery remained miniscule, other agencies had developed tools to classify and surveil people and goods that entered the country while pursuing fugitives who exited it.Footnote ⁴⁶ In this sense the Trading with the Enemy Act represented less a clear break with the past and more an acceleration of previous trends.Footnote ⁴⁷

Still, the scale of the effort was dramatic. In a fawning January 1918 article, the New York Times marveled at the power and influence of A. Mitchell Palmer, the Alien Property Custodian in charge of overseeing seized enemy assets. His organization was at once “the biggest trust institution in the world, a director of vast business enterprises of varied nature, a detective agency, and a court of equity.” It already held $135 million worth of enemy property, and daily took in more. “The noon conferences of executives of the organization which meet in Mr. Palmer's office every day decide the fate of millions of property at each sitting,” the Times explained. Palmer had become a kind of “general receiver,” running all kinds of businesses. He was, a later headline quipped, the “Biggest Big Business Man.”Footnote ⁴⁸

Initially such authority was meant to be temporary. During the war, former (and future) Supreme Court justice and 1916 presidential candidate Charles Evans Hughes had defended the expansion of state power on the grounds that “the power to wage war is the power to wage war successfully.”Footnote ⁴⁹ Expanded powers during wartime were part of the Constitutional plan, he argued, but only if they were restricted to wartime.Footnote ⁵⁰ Initially American officials seemed to share this view. They had vowed to restore purloined property after the armistice. “[T]here is no thought of a confiscation or dissipation of property thus held in trust,” Palmer assured.Footnote ⁵¹ This was “a protection to the property owner against unjust seizure,” promised secretary of state Robert Lansing.Footnote ⁵² To confiscate property would undermine Americans’ vision of their role in the world. “International law does not sanction that, and the United States is not a pirate nation,” declared one newspaper editorial. Surely “[a]fter the war, the right of ownership will be recognized, and there will restoration of the property taken.”Footnote ⁵³

This promise proved empty. Instead, a series of amendments to the Trading with the Enemy Act gave Palmer ever increasing powers over seized property. On March 28, 1918, he received the authority to sell off seized assets.Footnote ⁵⁴ Palmer argued for these powers on the grounds that German investment was not simply a private commercial matter, but formed part of a threatening national strategy. The “great German-owned industrial establishments were spy centres filled with the agents of Germany long plotting against the safety of the United States,” Palmer claimed. “It has been a knife at the throat of America.”Footnote ⁵⁵ Critics would later allege that the true motivation for confiscation was personal enrichment. Indeed, after the war many well-connected individuals bought companies at below-market prices.Footnote ⁵⁶ And a series of high-profile scandals ensnared Palmer's successors in the 1920s. In 1927, for instance, Thomas W. Miller was sentenced to eighteen months in jail for returning some $6 million in assets to a German-linked concern in exchange for a $50,000 bribe.Footnote ⁵⁷

The Trading with the Enemy Act also boosted U.S. corporate fortunes. On November 4, 1918—a week before the armistice—an amendment allowed Palmer to permanently repossess German chemical patents. In April 1919, his successor Francis P. Garvan sold 4,500 patents to the newly formed Chemical Foundation, of which Garvan was president.Footnote ⁵⁸ Though their value was estimated at up to $8 million, they were transferred for only $250,000.Footnote ⁵⁹ The Foundation then licensed them to U.S. chemical firms, helping to jumpstart the postwar U.S. chemical industry, which eventually emerged as a challenger to German concerns.Footnote ⁶⁰

The end of the war brought little relief for foreign property owners. In 1921, under the Congressional resolution that formally ended the war with Germany, the United States “retained” all the property it had seized.Footnote ⁶¹ This echoed Article 297 of the Versailles Treaty, which permitted Entente nations to use enemy property to repay the claims of their citizens against the defeated powers.Footnote ⁶² Congress meanwhile left the Trading with the Enemy Act in place, even as it terminated most other wartime measures. As Representative Nicholas Longworth (R-OH) explained: “The trading with the enemy act is now the sole bar to the wholesale dumping into the American market of German goods, notably dyestuffs, coal-tar products, and so forth, and the only safeguard absolutely to the existence of the new chemical industry in this country.”Footnote ⁶³

Thus temporary seizure had become permanent confiscation—a development that drew complaints even in the United States. Confiscating private property was a “relic of barbarism,” a job for Vikings, not civilized nations, critics howled.Footnote ⁶⁴ Plus it was counterproductive. Would foreigners continue to invest in the United States? Would Americans, fearing reprisals, invest abroad? International lawyers and conservatives commonly made such complaints but with little impact; during World War II the United States would seize foreign assets on an even bigger scale (by one reasonable estimate some $8 billion compared to $500 million in World War I), and hold them after the war's end.Footnote ⁶⁵ In this way the effects of warfare on private property continued long after “wartime” had officially ended.Footnote ⁶⁶

More fundamentally, World War I crystallized new conceptions about the relationship between property and war.Footnote ⁶⁷ Economic warfare, of course, was not new. Nor was the idea that threats to property might enter into the calculus of going to war in the first place. But private property, even far from the battlefields, seemed newly vulnerable in the 1910s. At the start of the decade, the British author Norman Angell's The Great Illusion—which contended that, given growing economic interdependence, modern wars had become economically irrational— sold more than two million copies.Footnote ⁶⁸ Though the Great War falsified Angell's accompanying prediction—that such wars were therefore unlikely to occur—it validated his ideas about the complexities of modern international economic relations.Footnote ⁶⁹ No longer could one expect private property to remain unaffected by international conflict. Moreover, the successes of the Allied blockade had proven the power of the “economic weapon,” and architects of the postwar order made economic sanctions central to their vision of collective security.Footnote ⁷⁰ Woodrow Wilson, for instance, praised Article 16 of the League Covenant, which called for a mandatory embargo of aggressor nations.Footnote ⁷¹ After World War I, economic sanctions and other forms of economic warfare would become increasingly important to foreign policymakers.

Though the Trading with the Enemy Act survived the end of World War I, it remained, in the eyes of most, a wartime law—until 1933, that is, when Franklin D. Roosevelt invoked it as the legal authority to proclaim a banking holiday, in other words to temporarily ban all banking transactions.Footnote ⁷² He cited section 5(b) of the act, which authorized the president to “investigate, regulate, or prohibit” all financial transactions involving foreign countries.Footnote ⁷³ The origins of 5(b) are obscure, “short and sketchy,” as a senate committee later described its legislative history.Footnote ⁷⁴ Congress wrote section 5(b) into the act during a struggle between Commerce and Treasury officials over which department would have authority over enemy financial transactions. Milton C. Elliott, general counsel of the Federal Reserve Board, offered what became 5(b) as an amendment; crucially its language applied not only to enemies but also to transactions “between the United States and any foreign country, whether enemy, ally of enemy, or otherwise.”Footnote ⁷⁵ In 1966, a lawyer who had been one of Elliott's clerks claimed that this broad language was a “sleight-of-hand” inserted intentionally so as to ensure that section 5(b) survived the war.Footnote ⁷⁶ In any case there was little discussion at the time. Legislators appeared to see the act as a law that would be invoked during future wars, but not in times of peace.Footnote ⁷⁷ If Congress had intended the Trading with the Enemy Act to grant blanket authority to handle domestic economic problems during a time when there was no “enemy” and no war, no one had said so publicly in 1917. Roosevelt's stretching of the law thus often serves as an exhibit in accounts of the rise of unaccountable executive power and the exceptional malleability of law.Footnote ⁷⁸

But how exactly did the Trading with the Enemy Act wind up as the justification for the Bank Holiday? In 1932 the general counsel of the Federal Reserve Board, Walter Wyatt, had produced a memorandum asserting that 5(b) granted the authority to halt domestic financial transactions.Footnote ⁷⁹ President Herbert Hoover's attorney general, William D. Mitchell, was skeptical, but after being shown Wyatt's memorandum he grudgingly conceded that 5(b) offered “sufficient color of authority … if [the president] felt that the emergency justified it.”Footnote ⁸⁰ Mitchell added, however, that he thought the legality of executive order rested on “only a ‘shoe string’” and advised President Hoover not to invoke the act unless the incoming Democratic Congress would promise to uphold it.Footnote ⁸¹ But Senator Carter Glass (D-VA) doubted whether the Trading with the Enemy Act could be applied in peacetime.Footnote ⁸² Wary of being overturned by Congress, Hoover decided not to act.

Roosevelt had fewer scruples about presidential power. His administration issued executive orders at an unprecedented pace: 1,486 in the first term alone.Footnote ⁸³ He often justified his actions by comparing the economic crisis to wartime. Indeed he first discovered Wyatt's memo and the potential of the Trading with the Enemy Act when he asked an aide to search out powers left over from the war that might be used to fight the depression.Footnote ⁸⁴ And in his inaugural address, perhaps alluding to the act, he promised to “ask the Congress for the one remaining instrument to meet the crisis—broad Executive power to wage a war against the emergency, as great as the power that would be given to me if we were in fact invaded by a foreign foe.”Footnote ⁸⁵

Roosevelt hoped to fit his emergency actions into a constitutional framework. Upon learning of Wyatt's memo, he sought multiple legal opinions. The incoming attorney general, Homer Cummings, skipped most of the inauguration in order to read the legislative history of the act.Footnote ⁸⁶ Roosevelt wrote in his diary that his advisers had considered and rejected “forty-eight different methods” of solving the banking crisis before “Attorney General Cummings reported favorably on power to act under the 1917 law.”Footnote ⁸⁷ These men deemed it important to provide a legal justification for their actions, and the presence of the Trading with the Enemy Act made that easier than it otherwise might have been.

Congress also legitimized the president's unilateral actions by passing the Emergency Banking Act just three days after Roosevelt's proclamation. The House acted in record time, voting unanimously after an abbreviated forty minutes of debate; the Senate approved the legislation three hours later before copies of the bill had even been printed.Footnote ⁸⁸ “I am so impressed with the necessity of the case … that I am not even going to mention those things to which I take exception,” explained Senator David A. Reed (R-PA).Footnote ⁸⁹

The Emergency Banking Act both blessed Roosevelt's legal manipulations and transformed the Trading with the Enemy Act in consequential ways. Section one explicitly “approved and confirmed” the president's actions while section two amended section 5(b) of the 1917 measure to clarify that the president could invoke the act's powers “[d]uring time of war or during any other period of national emergency declared by the President.”Footnote ⁹⁰ The law now explicitly authorized peacetime use.

Within a few years the implications of this shift became clear. On December 12, 1937, during its war with China, Japan bombed and strafed the USS Panay, a U.S. Navy gunboat anchored in the Yangtze River above Nanking.Footnote ⁹¹ Hoping to “quarantine” the Japanese, Roosevelt asked secretary of the treasury Henry Morgenthau, Jr. to find a way to cut off the flow of funds to Japan. Morgenthau's general counsel, Herman Oliphant, produced a secret memorandum holding that the Trading with the Enemy Act permitted the president to declare a “national emergency” and prohibit foreign exchange.Footnote ⁹² Oliphant, Harry Dexter White, and other advisers persuaded Morgenthau that such an action would enable a complete economic blockade of Japan.Footnote ⁹³ When Morgenthau shared the memo with Roosevelt, the president was surprised to see the reference to the Trading with the Enemy Act: “My God, I completely forgot about it.”Footnote ⁹⁴

Roosevelt ultimately decided not to invoke the wartime law in 1937, but he remembered its potential from that point forward.Footnote ⁹⁵ In April 1940 when Germany invaded Denmark and Norway, American officials worried that the Nazis might make use of Danish and Norwegian assets held in the United States. Morgenthau convinced the president to invoke the Trading with the Enemy Act, which he did in Executive Order 8389 on April 10, 1940.Footnote ⁹⁶ Bernard Bernstein, an assistant to Oliphant at the Treasury, then took “the old documents that had been drafted [for Japan in 1937] and rewrote them to apply to Denmark and Norway.”Footnote ⁹⁷ Some government lawyers believed that section 5(b) of the act only applied to bank transfers, and could not be used to freeze securities themselves. But Bernstein convinced Attorney General Robert Jackson of the law's broader writ.Footnote ⁹⁸ On May 7, Congress amended the Trading with the Enemy Act to ratify Roosevelt's actions and make clear its application to securities. This marked the beginning of the Foreign Funds control system, administered by a new office in the Treasury Department.Footnote ⁹⁹ The asset freeze would subsequently apply to every new country invaded by the Germans, and, by June 1941, to virtually all of Europe.Footnote ¹⁰⁰

Meanwhile the Trading with the Enemy Act loomed over U.S. negotiations with Japan. Concerned about Japanese plans to expand into Southeast Asia, as well as its continuing war in China, Washington turned to economic coercion. Mostly this took the form of export controls. Washington made it more difficult for Japan to obtain sufficient supplies of refined gasoline, scrap metal, and other strategic goods, for example.Footnote ¹⁰¹ But in July 1941, after Japanese forces invaded southern Indochina, Roosevelt invoked the Trading with the Enemy Act to freeze Japanese assets.Footnote ¹⁰² Though the president hoped to maintain some flexibility—to license some shipments of goods in return for Japanese diplomatic concessions—mid-level officials led by Dean Acheson interpreted the president's orders so strictly as to make it impossible for Japan to use gold reserves it had amassed to purchase oil and other necessities. Japanese hardliners cited these actions in convincing their colleagues to launch their attack on Pearl Harbor on December 7, 1941.Footnote ¹⁰³

After the U.S. declaration of war, Congress once again amended the Trading with the Enemy Act. This was necessary, as one observer pointed out, because “the legislative mind was in a state of great vagueness” about the status of the 1917 law. Section 5(b) certainly remained in effect, but was the rest of the law still applicable during wartime?Footnote ¹⁰⁴ As part of the First War Powers Act (which passed within a week of being introduced), Congress amended section 5(b) to grant the president vaster powers, including the ability to “vest” seized foreign property—meaning that such property could be licensed, liquidated, or sold. Importantly, the revised act clearly applied to all foreign countries (not merely enemy ones), and could be invoked “during the time of war or during any other period of national emergency declared by the President.”Footnote ¹⁰⁵ Influenced by the transformation of governmental power during the New Deal, as well as the growing recognition of the value of economic warfare, Congress seemed comfortable granting this broad power to the executive.Footnote ¹⁰⁶ Unlike the original act of 1917, this amended version was designed to continue to function in peacetime. As a lawyer noted in 1943, the amended act “looks far ahead, foreshadowing and forestalling events to meet not only wartime exigencies but national peacetime emergencies as well.”Footnote ¹⁰⁷

By 1945 there was little that U.S. presidents could not do, legally speaking, in the realm of economic warfare. By declaring the existence of a national emergency (the definition of which was left up to presidents themselves), they could regulate, or ban entirely, virtually all financial transactions. They could not only seize and hold foreign-owned property but dispose of it as they saw fit.Footnote ¹⁰⁸ Wartime offices tasked with implementing sanctions and foreign funds control blossomed into a permanent bureaucratic apparatus, created with Trading with the Enemy Act authority, and now located primarily in the Treasury Department's Office of Foreign Assets Control (OFAC).Footnote ¹⁰⁹

During the Cold War the act underwrote an expansive program of economic warfare. In 1950, after the outbreak of hostilities in Korea, President Harry Truman declared a “national emergency” under the Trading with the Enemy Act to enforce sanctions against North Korea and China.Footnote ¹¹⁰ That emergency remained in place for twenty-five years, during which time section 5(b) also justified sanctions against Vietnam, Cambodia, and Cuba.

Sanctions disrupted existing trade relationships and took other concrete tolls. For instance, OFAC ensured that products of Communist China such as shrimp, tofu, and hog hair brush bristles did not reach American shores.Footnote ¹¹¹ The law also had other unexpected outcomes. To take just three of many possible examples, OFAC prevented Williams College from retrieving a fourteenth-century Chinese painting it had loaned to a Canadian art exhibition; it sequestered Eldridge Cleaver's book royalties; and it barred philatelists from importing Chinese and Korean stamps.Footnote ¹¹²

Sanctions programs authorized by the Trading with the Enemy Act also enhanced the reach of U.S. global power by instituting worldwide programs of economic surveillance and control. Enforcing the embargo on China proved particularly nettlesome, because it was difficult to determine whether goods exported from Hong Kong and other Asian countries had actually been produced in China. As one American official later recalled: “How about if the chicken comes from Communist China and is brought across the border into Hong Kong live and lays the egg on the Hong Kong side, is that then a communist product?”Footnote ¹¹³ OFAC responded by creating a category of “Chinese-type goods.”Footnote ¹¹⁴ Any such items presumed to have Chinese origins were thus inadmissible to the United States without a special certificate of non-Chinese production. Indian lychee nuts and Japanese soy sauce fell victim to this designation.Footnote ¹¹⁵ In one case, these regulations stopped the import of paintings produced by Chinese refugees in Hong Kong, which the Anti-Communist League of America had hoped to sell in the United States to raise funds for its crusade against Red China.Footnote ¹¹⁶

Sanctions formed part of a broader program of economic warfare that operated alongside military alliances, diplomatic initiatives, and covert operations during the Cold War. Ironically, notes Alan Dobson, it was “the free-market USA” that “looked most often to economic sanctions, embargoes, cold economic warfare and economic warfare as means of exerting influence in international affairs.”Footnote ¹¹⁷ With the United Nations Security Council deadlocked between the United States and Soviet Union, virtually all U.S. sanctions programs functioned either unilaterally or with Cold War allies. Their effects were mixed. The vast majority of sanctions, scholars have found, failed to achieve their ultimate goals.Footnote ¹¹⁸ Embargoes on Cuba and China did not dislodge Communist governments. The strategic embargo on the USSR did little to hinder the Soviet military buildup. Yet sanctions did sometimes provide U.S. policymakers with leverage. Frozen assets could be exchanged for expropriated American properties. And sanctions might be loosened or tightened as part of larger negotiations. In the lead up to U.S. rapprochement with China in 1971, for instance, the Treasury Department gradually relaxed the Chinese embargo, allowing tourist purchases and even removing the “Chinese-type” goods designation from certain articles.Footnote ¹¹⁹

Throughout the Cold War, the Trading with the Enemy Act's authority was exercised pursuant to the declared existence of a national emergency. In the early years, some doubts about unilateral executive control of these powers lingered. In 1950, while noting that the law granted the power to restrict Soviet imports, a State Department employee fretted that “Congress would not favor use of this act for the purpose now being discussed.”Footnote ¹²⁰ And as late as 1954 a legal adviser warned against deploying the Trading with the Enemy Act for anything other than “a most serious type of situation,” because doing so might “result in curtailment of the authority itself.”Footnote ¹²¹ The executive's emergency powers seemed reliant on at least implicit consent of Congress and the public.

Yet as the Cold War continued, public faith in executive power grew. A 1959 Gallup poll found 61 percent of respondents favoring the expansion of presidential authority, compared to only 17 percent who wanted Congress to have more power.Footnote ¹²² Academics and constitutional scholars argued that the nation needed a strong executive to organize and unify its people. Congress, as the political scientist Clinton Rossiter explained in 1956, was “no longer minded or organized to guide itself.”Footnote ¹²³ Truman's decision to use force against North Korea in 1950 without asking Congress to declare war stood as a new precedent, which generated surprisingly little second-guessing.Footnote ¹²⁴

By 1960, as the Eisenhower administration debated how to respond to Fidel Castro's Cuban revolution, officials worried more about the Trading with the Enemy Act's ramifications on relations with U.S. allies. Eisenhower balked at invoking the act because it would mean “designating Cuba as an enemy,” which might undermine the administration's attempts to isolate Castro in the hemisphere. More importantly, while cancelling Cuba's sugar import quota could be justified as the defense of American property in response to Cuban nationalizations, invoking the Trading with the Enemy Act would constitute a clear act of economic warfare. A unilateral act of this sort would undermine the multilateral foundations of the Rio Treaty, a 1947 hemispheric mutual defense agreement, and might drive other Latin American states into Castro's camp.Footnote ¹²⁵ Combined with the fact that Cuba had relatively little trade or property left to seize in the United States, the Eisenhower and then the Kennedy administrations resisted invoking the act until 1963.Footnote ¹²⁶

Concerns about international impacts persisted. In 1970, one State Department memorandum listed the Trading with the Enemy Act as a possible source of authority for economic measures to counter the rise of airplane hijacking. Yet diplomatic officials also cautioned against its use. Invoking the act was the “equivalent of economic war,” warned a report prepared for Henry Kissinger. “No major industrial power uses any instrument of this intensity.”Footnote ¹²⁷ Still because the law offered broad emergency powers, it could be used as a backstop when other authorities lapsed. On four separate occasions between 1972 and 1976 Congress failed to reauthorize the Export Administration Act of 1969 (EAA) before it expired. The EAA had provided important statutory authority for banning strategic exports to the Soviet bloc. Declaring the loss of this authority as constituting an emergency, Presidents Nixon and Ford cited section 5(b) of the Trading with the Enemy Act to keep the EAA provisions in place.Footnote ¹²⁸ This pattern became so routine that some observers blamed the existence of 5(b) for Congress’ inability to reauthorize the legislation in the first place. Confident in the Trading with the Enemy Act's powers, “the administration had no incentive to press for [its] extension,” one Congressman observed.Footnote ¹²⁹

The Trading with the Enemy Act had become widely recognized—at least among career civil servants—as a ready tool of economic warfare.Footnote ¹³⁰ During the 1940s and 1950s, presidents had used it as part of their larger strategy to expand U.S. power around the world. Yet after the late 1960s, as the nation's international financial position deteriorated, they increasingly invoked it instead to shore up the U.S. economy. With the costs of the Vietnam War and the Great Society eroding the nation's balance of payments, on January 1, 1968, Lyndon Johnson cited the Trading with the Enemy Act (and Truman's 1950 declaration of emergency) in order to place controls on capital exports.Footnote ¹³¹ In 1971, Richard Nixon aimed to weaken the dollar, thereby making U.S. exports more attractive to foreign buyers. In August, he also unilaterally imposed a 10 percent tariff surcharge on many imports.Footnote ¹³² Nixon proclaimed the existence of an emergency and claimed authority under statutes “including but not limited to” the Tariff Act of 1930 and the Trade Expansion Act.Footnote ¹³³ The president did not cite the Trading with the Enemy Act directly because he was scheduled to meet with Emperor Hirohito of Japan, the nation most targeted by the surcharge. Discussion of the act at that meeting might have proved awkward.Footnote ¹³⁴

The surcharge was in place less than half a year; Nixon revoked it in December after other nations agreed to inflate their currency against the dollar.Footnote ¹³⁵ But in February 1972, Yoshida International, Inc., a New Jersey based subsidiary of a Japanese firm that imported zippers, sued, alleging that Nixon had exceeded his authority and demanding a return of the extra 10 percent it had paid on its imports. This would be a test case of presidential powers, and one with important financial ramifications: a victory for Yoshida would result in refunds to all affected importers, totaling some $500 million (nearly $3 billion in 2016 dollars).Footnote ¹³⁶ In 1974, a three judge panel of the U.S. Customs Court ruled for Yoshida. Neither the Tariff Act nor the Trade Expansion Act gave the president authority to set tariff rates without congressional approval, the court concluded. Administration lawyers raised the authority of section 5(b) of the Trading with the Enemy Act but the court rejected their argument. “To indulge in judicial rationalization in order to sanction the exercise of a power where no power in fact exists,” the judges wrote, “is to strike the deadliest of blows to our Constitution.”Footnote ¹³⁷

The government appealed, however, and in 1975 an appellate court reversed the lower court ruling. In passing and revising the Trading with the Enemy Act over the years, the court found, Congress had granted extremely broad power to the executive. Whereas the lower court imagined presidential authority to implement tariffs as a mere twig on the tree of the congressional power over foreign commerce, the appeals court contended that the Trading with the Enemy Act had, “Mendel-like,” created “a cross breeding which produced an economic emergency branch.”Footnote ¹³⁸

The Yoshida ruling preserved the executive branch's expansive reading of the Trading with the Enemy Act. But elsewhere the 1970s witnessed challenges to executive power unprecedented since World War II. This formed part of a broader disaffection with the federal government in the wake of the Vietnam War and the social and cultural clashes of the late 1960s. In 1964, more than 70 percent of poll respondents said they trusted Washington “always” or “most of the time.” By 1972 less than half did, and by 1974, after the Watergate scandal, the percentage plummeted into the low thirties.Footnote ¹³⁹ Revelations of domestic spying, foreign assassination plots, and other sordid CIA actions, along with Nixon's claim of presidential immunity, enhanced fears of executive power. Arthur Schlesinger, Jr., who had made a career of writing histories that extolled the value of activist presidents, coined the phrase “Imperial Presidency” to warn the public.Footnote ¹⁴⁰

In this environment a “resurgent” Congress challenged unilateral executive power. A series of laws established new oversight for intelligence operations, expanded public access to executive documents, put limits on campaign financing, and defended legislative control of the budgeting process. In 1973 Congress displayed a new “solicitude for its own institutional honor” by passing the War Powers Resolution over Nixon's veto in an attempt to limit the president's ability to use unilateral military force.Footnote ¹⁴¹

It made sense in this context that presidential emergency powers would come under increasing scrutiny. In 1973, a Senate joint committee led by Frank Church (D-ID) and Charles McC. Mathias, Jr. (R-MD) began investigating ways to wind down Truman's 1950 proclamation of emergency.Footnote ¹⁴² Requesting to see copies of every presidential emergency declaration, committee members were shocked to discover that there were actually four states of emergency still in place, including Roosevelt's proclamation from 1933.Footnote ¹⁴³ (“After 41 Years, The Depression Finally Ending,” the New York Times cracked when the emergency was finally terminated.Footnote ¹⁴⁴) The committee identified 470 provisions of federal law that could be activated by a declaration of emergency and warned that “This vast range of powers … confer enough authority to rule the country without reference to normal constitutional processes.”Footnote ¹⁴⁵ The Washington Post described the committee's report as “the blueprint for an American dictatorship.” Alarmist statements from other newspapers followed.Footnote ¹⁴⁶ The Philadelphia Inquirer, for instance, warned that it was perfectly legal for the president to “start seizing private property, take control of broadcast stations and issue orders restricting travel.”Footnote ¹⁴⁷

Amidst public scrutiny and legislative assertiveness, Congress passed the National Emergencies Act in 1976, which ended all existing national emergencies (as of 1978) and implemented new oversight requirements. However, at the urging of the Ford administration, Congress explicitly exempted the Trading with the Enemy Act.Footnote ¹⁴⁸ Rescinding section 5(b) would have cancelled numerous programs, including full or partial embargoes against North Korea, Vietnam, Cambodia, and Cuba; temporary regulations that backed up the Export Administration Act; and foreign funds control regulations that continued to block property of Czechoslovakia, East Germany, and Lithuania, “pending settlement with those countries for their illegal expropriation of private property following World War II.”Footnote ¹⁴⁹ Recognizing how deeply woven into the fabric of U.S. statecraft the Trading with the Enemy Act had become, Congress tasked the House with recommending revisions.Footnote ¹⁵⁰

At first it appeared that these revisions might be substantial. Representative Jonathan Bingham (D-NY), a critic of the continued embargoes against Vietnam and Cuba, chaired the subcommittee in charge of examining the matter.Footnote ¹⁵¹ In January 1977 Bingham introduced a bill designed simply “To repeal section 5(b) of the Trading With the Enemy Act of 1917.”Footnote ¹⁵² When that failed, he introduced the Economic War Powers Act, which would have forced the president to “consult with the Congress before imposing any trade embargo on any country” and which would have automatically ended any embargo after sixty days unless Congress adopted a concurrent resolution authorizing its continuation. Embargoes mandated by international organizations like the United Nations would be exempt from this requirement.Footnote ¹⁵³

Bingham may have sensed an opportunity to use revision of the Trading with the Enemy Act to rein in the expanding use of unilateral sanctions. A memorandum preserved in the subcommittee files criticized the “total prohibition of economic and financial transactions with any foreign nation” for being “ineffective,” for impairing “the development of an open world economy” and the “principles of international law,” and for leading to the “undesirable and generally counterproductive” isolation of peoples from one another.Footnote ¹⁵⁴ When Carter administration officials testified in favor of retaining most of the provisions of 5(b), Bingham exploded: “I frankly have not been as angry about anything done by the executive branch in a long time.”Footnote ¹⁵⁵

Yet inter-branch conflict quickly fizzled. The administration would compromise, representatives from the State and Treasury Departments promised. Rather than rely on outdated authorities like Truman's 1950 emergency proclamation, the president was now willing to declare a new state of emergency whenever required. He would inform Congress and the public. “Under what we have proposed,” Treasury official C. Fred Bergsten promised, “there would never be a situation 20 or 25 years from now, where any Member of the Congress would make the charge which you now quite rightly raise.”Footnote ¹⁵⁶

Bingham accepted the peace offering and apologized for his outburst. “Perhaps I overstated it,” he admitted.Footnote ¹⁵⁷ Instead of debating the merits of the U.S. global sanctions regime, discussion focused on abstract questions about the balance of power. It was not what the administration did that seemed to bother Bingham most, but whether or not the president informed Congress of its actions and whether or not the administration acted in the name of emergencies that no longer existed. Continuing embargoes on Cuba and China might be justified, he argued, but “I just don't think it is right for us to base those actions on a false premise.”Footnote ¹⁵⁸ So long as the executive declared new states of emergency when needed, Bingham reasoned, this problem could be avoided.Footnote ¹⁵⁹

Thus instead of the Economic War Powers Act, the subcommittee reported out what Bingham called a “procedural bill,” designed to “improve the policies and procedures which will govern future uses of emergency powers.”Footnote ¹⁶⁰ Passed by voice vote in the House and Senate, and signed into law by President Carter on December 28, 1977, the act amended the Trading with the Enemy Act so as to limit its use to wartime—no longer would a mere declaration of emergency during peacetime suffice to activate the statute.Footnote ¹⁶¹ The amendment did, however, grandfather in existing sanctions programs, which is why every year the president must certify that Cuban sanctions continue to be in the “national interest.”Footnote ¹⁶²

At the same time, however, Congress passed a new law, the International Emergency Economic Powers Act (IEEPA), which reinstated most of the provisions of the old law's section 5(b).Footnote ¹⁶³ In other words, while presidents could no longer invoke the Trading with the Enemy Act during peacetime, they could now rely on the IEEPA for nearly all the same powers. Congress did add a few constraints. Under the IEEPA the president could “freeze but not seize” foreign property, could not target purely domestic transactions, had to consult with Congress before issuing new declarations of emergency, and could exercise powers only under a relevant declaration of emergency—no more relying on decades-old, unrelated proclamations.Footnote ¹⁶⁴

But in practice these restrictions amounted to very little. In three cases in the 1980s the Supreme Court invalidated many of the IEEPA's limitations on executive power. Dames & Moore v. Regan (1981) granted the executive broad discretion to dispose of seized property.Footnote ¹⁶⁵ Regan v. Wald (1984) held that the Reagan administration could expand Cuban sanctions to include activities that were not illegal when the Trading with the Enemy Act was grandfathered in 1977.Footnote ¹⁶⁶ And INS v. Chadha (1983) found that the “legislative veto”—at issue in Congress's ability to invalidate a president's proclamation of national emergency—was unconstitutional.Footnote ¹⁶⁷ Combined with the retrenchment of Congressional activism since its 1970s peak, these rulings mostly erased any limitations on executive discretion.Footnote ¹⁶⁸ Once again by 1987 a legal observer could claim that “the President's powers to impose economic sanctions on foreign countries under these statutes are practically unlimited.”Footnote ¹⁶⁹

Strikingly, while the executive had been reluctant to use the Trading with the Enemy Act outside of the most serious circumstances, presidents have used the IEEPA with abandon.Footnote ¹⁷⁰ By formalizing the process of emergency rulemaking, Congress seems to have encouraged it. As of February 2018 there were twenty-eight active sanctions programs, nearly all based at least in part on national emergencies declared pursuant to the IEEPA. Targets included terrorists, drug dealers, dictators, enemy/rogue/failed states, organized crime, and six justices of the Venezuelan supreme court.Footnote ¹⁷¹ As sanctions have become a normalized, permanent component of American foreign relations, corporations have designed internal company policies to enforce their proscriptions. Failing to do so—as when the Honda Corporation of America leased cars to Cuba's Canadian embassy—can result in Treasury Department fines. Thus the legacies of the Trading with the Enemy Act stretch far and wide: for example, Iranian Zumba instructors have had their licenses revoked because U.S.-based Zumba Fitness fears running afoul of sanctions.Footnote ¹⁷²

Meanwhile the Trading with the Enemy Act remains on the books. In October 2016 a leading sanctions expert warned that, if elected president, Donald Trump could unilaterally impose a new tariff regime by citing, among other things, “the granddaddy law … the Trading with the Enemy Act of 1917.”Footnote ¹⁷³ Legal experts have disagreed, but given the twists and turns of the last century, it would be difficult to rule anything out.Footnote ¹⁷⁴ In any case, sanctions became a key political flashpoint in the first year of the Trump administration. Alleged Russian collusion with the Trump campaign seems to have been motivated at least in part by desires to relax sanctions against Russian nationals, many of which were imposed under the IEEPA.Footnote ¹⁷⁵ The Trump administration and Congress have since sparred over whether or not to impose additional sanctions on Russia for its attempts to interfere in the U.S. political system.Footnote ¹⁷⁶ Presidential discretion over the implementation of sanctions gives these debates extra importance.

The authors who drafted the Trading with the Enemy Act in 1917 would no doubt be surprised to know that their creation shaped the politics of presidential scandal in 2017. But this should be less surprising in light of how succeeding administrations have woven the act into the fabric of twentieth-century U.S. foreign policy. This seemingly limited law, designed for early-twentieth-century wartime, went dormant rather than expiring at the end of World War I, only to reemerge to justify state authority for a widening array of powers. Seeking legal precedent and authority for their actions, presidents and their advisers found the act both highly useful and sufficiently malleable. And while the law was invoked in the context of presidentially declared emergencies, Congressional and judicial acquiescence have also been essential to the exercise of this executive power.

The secret and surprising life of the Trading with the Enemy Act reflects Americans’ embrace of sanctions as part of a global strategy to construct and preserve an American world order. And the law provides one example of how the expansion of U.S. power has required the development of a new repertoire of legal techniques. Other statutes—many with secret lives of their own—deserve to have their stories told as well. Collectively they can help historians understand how the repurposing of laws designed for one goal often serves others—a process that has helped to construct the modern U.S. state and the American century. As peacetime has become a permanent wartime, the century-old legacy of wars past continues to shape the present.