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Pearl Harbor (see more photos) on Oahu, Hawaii, is a significant historical location. It was here where the Japanese attacked the U.S. Pacific fleet on December 7, 1941, which led the United States to enter World War II. Today, Pearl Harbor (including the Arizona Memorial) is the most-visited destination on Oahu, with more than 1.5 million visitors per year.
In the early morning of Dec. 7, 1941, the U.S. naval base at Pearl Harbor, Hawaii, was attacked by the Japanese military. At the time, Japan's military leaders thought the attack would neutralize American forces, allowing Japan to dominate the Asia Pacific region.