What was the main reason USA was drawn into ww2

Answer 1

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.