The United States entered World War II primarily due to the Japanese attack on Pearl Harbor, shifting from isolationism to active participation in the conflict.
The primary reason the U.S. entered World War II was the Japanese attack on Pearl Harbor, which prompted the United States to join the war after years of isolationism. Prior to this, the U.S. had provided aid to Allied nations like Britain through initiatives such as the Lend-Lease policies.
Franklin D. Roosevelt's delicate balance of supporting Allied efforts while publicly maintaining neutrality shifted with the events of Pearl Harbor, leading the U.S. to actively participate in the war.
As Japan's attack provoked the U.S.'s involvement in the war, it marked a turning point where the nation mobilized its industrial capacity to support the Allied cause.
https://brainly.com/question/33633139
