16: Selective Training and Service Act of 1940 introduces the first peacetime conscription (this time for men between 21 and 35) in United States history.
16日：《1940年选择性培训和服务法》（Selective Training and Service Act of 1940）出台，美国有史以来首次实行和平时期徵兵制，对象为21至35岁男性。