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ruled by Japan
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North korea start a war with south korea
north korea is communist but south korea is anti-communist and there was bitter hostility between the north's communist leader,kim il sung and syngman rhee,present of south korea -
most of the land controled by north korea
most of the land controled by north korea except a samll corner of south-east korea was under communist control -
south korea pushed back
The involvement of the United Nations and the United States -
north korea started to fight back ，War enters the stage of white hot
China dispatched a large number of troops to fight back，