The attack on Pearl Harbor on December 7, 1941, led to the United States joining the Allied Powers in World War II. Prior to the attack, the United States had remained neutral in the conflict, but the surprise attack by the Japanese forces provoked the U.S. to declare war on Japan the following day. This ultimately led to the United States joining the Allied Powers, including countries such as the United Kingdom, Soviet Union, and China, in the fight against the Axis Powers of Germany, Japan, and Italy.
