The main reason the USA was drawn into World War II was the Japanese attack on Pearl Harbor on December 7, 1941. The attack prompted the US to declare war on Japan and subsequently get involved in the wider global conflict. Prior to the attack on Pearl Harbor, the US had adopted a policy of neutrality and had been providing support to the Allies through the Lend-Lease Act, but did not directly engage in the war until the attack.
The main reason the United States was drawn into World War II was the attack on Pearl Harbor by the Japanese on December 7, 1941. The surprise attack on the US naval base in Hawaii led to a declaration of war against Japan by the United States. This attack was seen as a direct threat to American security and brought the US into the global conflict.
