War and neutrality — War in general — Effects of the outbreak of war — Trading with the enemy — State of national emergency short of war — Regulation of transactions involving property in which a foreign State has an interest — Trading with the Enemy Act — Compatibility with United States Constitution — The law of the United States

States as international persons — In general — Sovereignty and independence — Conduct of foreign relations — Power of Congress to delegate extensive powers to President for legitimate purposes of foreign relations — Power more extensive than in field of domestic affairs — Trading with the Enemy Act — The law of the United States