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Japan had took control of Manchuria by a fight between China and Japan and Japan had won Manchuria because China had been weakened by civil war.
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Japanese had attacked military base at Pearl Harbor and that had made American in surprise and ahd led to the Pacific War between japan and U.S
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Japan had been bombed by American planes but Japanese refused to surrender
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Amercia had dropped atomic bomb at Hiroshima and Nagasaki. It had killed Hundreds of thousands of Japanese. They had bombed Hiroshima and Nagasaki because Japan had bombed military base at Pearl Harbor in Hawaii
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Japan had signed a peace treaty with most of the nations they had fought against in the war.