Pearl Harbor is a lagoon harbor on the island of Oahu, Hawaii, west of Honolulu. Much of the harbor and surrounding lands is a United States Navy deep-water naval base. It is also the headquarters of the United States Pacific Fleet. The U.S. government first obtained exclusive use of the inlet and right to maintain a repair and coaling station for ships here in 1887.

This place is well-known for the Battle of Pearl Harbor, which became a cause of the United States' entry into WWII. On the morning of the 7th of December, 1941, the empire of Japan launched an attack on American bases without warning. 2,335 American servicemen died during the attack. The next day after the battle the US declared war on Japan, and several days after Italy and Germany declared war on the US. Some historians believe that American government and British government as well knew about the attack and did nothing to prevent it for the purpose of entering the war. Anyway, most scholars and researchers usually reject such a theory.

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