The Pearl Harbor Attack occurred on December 7, 1941, when the Imperial Japanese Navy launched a surprise military strike against the United States naval base at Pearl Harbor in Hawaii. The attack aimed to weaken the U.S. Pacific Fleet and prevent interference with Japanese military operations in Southeast Asia. The assault resulted in significant damage, sinking or damaging multiple battleships and destroying numerous aircraft. Over 2,400 Americans lost their lives, prompting the United States to formally enter World War II the following day, declaring war on Japan. This event marked a pivotal moment in American history and global conflict.