US steps away from isolationism By Mackmekler Sep 21, 1939 Cash-and-Carry provision 1940 German victories lead to increased spending Sep 16, 1940 Selective Training and Service Act 1941 Lend-Lease Act Sep 11, 1941 Shoot-on-Sight Dec 7, 1941 Attack on Pearl Harbor Dec 7, 1941 US enters World War II