The Imperial Japanese Navy carried out a surprise attack on the United States Pacific Fleet and its defending Army and Marine air forces at Pearl Harbor, Oahu, Hawaii, at 7:48 a.m. Hawaiian time, Dec. 7, 1941. The day after the attack, President Franklin D. Roosevelt asked Congress to declare war on Japan and called Japan’s act a “deliberate deception.” Congress approved his proclamation, and soon after, the U.S. officially entered WWII. Smoke pours from the USS Shaw, right, while in the foreground is the capsized mine layer Oglaga. To the left is the damaged cruiser USS Helena.