The Japanese attacked Pearl Harbor on December 7, 1941. This surprise military strike targeted the U.S. naval base in Hawaii, aiming to incapacitate the Pacific Fleet and prevent American interference in Japan's expansionist plans in Southeast Asia. The attack resulted in significant damage, sinking or damaging numerous battleships and aircraft while causing extensive loss of life. The event galvanized American public opinion and led to the United States formally entering World War II the following day. Pearl Harbor became a symbol of U.S. determination and resolve, transforming the nation’s foreign policy and military engagement on a global scale.