Historian Odd Arne Westad says the Communists won the Civil War because they made fewer military mistakes than Chiang Kai-shek and also because in his search for a powerful centralized government, Chiang antagonized too many interest groups in China. Furthermore, his party was weakened in the war against the Japanese.
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It depends on the country. Some countries have respect for their enemies and would return bodies of fallen soldiers. Others would keep them as trophies. It completely depends on the country.
People had nativist feelings at that time