"This country's at war"
The sunken battleship USS West Virginia (BB-48) during the Japanese air raid on Pearl Harbor, 7 December 1941
Public DomainThe sunken battleship USS West Virginia (BB-48) during the Japanese air raid on Pearl Harbor, 7 December 1941 - Credit: U.S. Navy

On December 8, 1941, the day after the Japanese attacked the American naval base at Pearl Harbor, America officially entered World War II after President Franklin Roosevelt addressed a joint session of Congress and called for a declaration of war against Japan.