The United States participated in World War II in different ways:
* United States home front during World War II
Military history of the United States during World War II
The military history of the United States during World War II covers the victorious Allied war against the Axis Powers, starting with the 7 December 1941 attack on Pearl Harbor and ending with the 2 September 1945 surrender of Japan. During ...
* United States non-interventionism before entering World War II