Attack on Pearl Harbor

The attack on Pearl Harbor was a pre-emptive military strike on the United States Pacific Fleet base at Pearl Harbor, Hawaii by the Empire of Japan's Imperial Japanese Navy, on the morning of Sunday, December 7, 1941 that made the United States enter World War II. Two aerial attack waves, totalling 350 aircraft, were launched from six aircraft carriers with the intent to destroy the United States Pacific Fleet.

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http://en.wikipedia.org/wiki/Attack_on_Pearl_Harbor