What happened on Decembe 71941 that led the U.S to getting fully involved in the war?

On December 7, 1941, Japan launched a surprise military attack on the U.S. naval base at Pearl Harbor in Hawaii. The assault resulted in significant loss of life and damage to the Pacific Fleet, prompting the United States to declare war on Japan the following day. This attack galvanized public support for entering World War II, marking a turning point that led to full U.S. involvement in the conflict.