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Japan participated in World War II. Created "Greater East Asia Co-prosperity Sphere" and strengthed ties with German and Italy.
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Japan bombed Pearl Harbor, Hawaii.
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Japan ruled an empire that stretched from the Aleutian Islands to the Solomon Islands, and the Wake Island.
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United States dropped an atomic bomb on Hiroshima.
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(No day, only month)
Japan signed a peace treaty with the Unted States. Soon afterwards, they signed a security treaty.