On December 7, 1941, a significant event occurred in the United States when Japan launched a surprise military attack on the naval base at Pearl Harbor in Hawaii. This attack resulted in significant loss of life, with over 2,400 Americans killed and numerous ships and aircraft destroyed. In response, the United States declared war on Japan the following day, marking its entry into World War II. This event not only shifted the course of the war but also transformed American foreign policy, leading to a mobilization effort that would change the nation profoundly.