The surprise Japanese attack on the U.S. naval base at Hawaii's Pearl Harbor came early in the morning on Sunday, Dec. 7, 1941, sinking several ships and killing more than 2,000 Americans. "Yesterday, December 7, 1941 a date which will live in infamy the United States of America was suddenly and deliberately attacked by naval and air forces of the empire of Japan," President Franklin Delano Roosevelt famously said in his address to a joint session of Congress the day after the shocking raid the day the U.S. formally entered World War II.