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In 1931, Japan took control over Manchuria, who was weakened by civil war.
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On December 7, 1941, Japanese bombers attacked the large U.S. militar base at Pearl Harbor, Hawaii.
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On August 6, 1945, the U.S. dropped an atomic bomb on the city of Hiroshima. Several days later, they dropped an even bigger bomb on Nagasaki. Hundreds of thousands were killed or injured.
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In September 1951, American occupation came to an end and Japan signed a treaty with many countries they fought with in war.
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In 1989, Emperor Hirohito of Japan died and his sson Akihito took the throne.