On December 7, 1941, Japanese forces launched a surprise attack on the U.S. naval base at Pearl Harbor in Hawaii. The attack destroyed or damaged 8 U.S. battleships and over 180 aircraft. Over 2,400 Americans were killed in the attack. In response, the U.S. entered World War II by declaring war on Japan. This engagement pulled the U.S. fully into what was already a global conflict between the Allied and Axis powers.