The attack on Pearl Harbor was a surprise military strike conducted by the Imperial Japanese Navy against the United States naval base at Pearl Harbor, Hawaii, on the morning of December 7, 1941. The attack led to the United States' entry into World War II. 2,400 Americans were killed during the attack, which lasted a mere ninety minutes. This could be described as the worst 90 minutes in our great nations history, The attack began at 7:55, catching the Americans off guard. Before the Americans knew it, the naval base of Pearl Harbor lay in pieces. Many of the men who worked on the base died due to the bombs, drowning, or being attacked by the sharks in the water. Merely a day later President Roosevelt summoned Congress, and the United States entered WW II, despite that fact that WW I had left America in terrible shape. The Americans were blinded by rage, and without better judgement, entered the war.