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On December 7, 1941, this bombing of a naval base in Hawaii brought the United States into World War II.
What is Pearl Harbor? The assault began with one Japanese dive-bomber followed by 360 Japanese warplanes. According to the History Channel, “With diplomatic negotiations with Japan breaking down, President Franklin D. Roosevelt and his advisers knew that an imminent Japanese attack was probable, but nothing had been done to increase security at the important naval base at Pearl Harbor.”