What was the point at which US actions were no longer neutral?

U.S. actions were no longer neutral during World War II when President Franklin D. Roosevelt initiated policies that clearly favored the Allies, such as the Lend-Lease Act in March 1941, which provided military aid to countries like Britain and later the Soviet Union. The situation escalated further after the Japanese attack on Pearl Harbor on December 7, 1941, prompting Congress to declare war on Japan the following day, officially entering the U.S. into the conflict. These actions marked a decisive shift away from neutrality toward active involvement in the war.