For a generation now, America has played a significant role in world affairs. Until Pearl Harbor a reluctant belligerent in World War II, this country was also slow to respond to the challenge of the Soviet Union in the immediate aftermath of that gigantic conflict. But for almost twenty-five years American Presidents have been more or less guided by the policy of “containment.” Eisenhower, Kennedy, and Johnson all introduced variations on the multiple themes of the policy adopted by Harry Truman. Yet each concluded that the world situation allowed no reasonable alternative to an activist American foreign policy in most areas of the globe.