The Attack on Pearl Harbor occurred on December 7, 1941, when the Imperial Japanese Navy launched a surprise military strike against the United States naval base 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 numerous ships and destroying hundreds of aircraft. Over 2,400 Americans lost their lives, leading to the United States' formal entry into World War II. This event marked a turning point in the war and reshaped global military strategies.