Korean War 100% happened because the United States sided with the Soviet Union Russia USSR instead of with Germany in world war 2
USSR took north half of Korea from Japan
United States took south half of Korea from Japan
After world war 2 ended each half fought each other
If USSR was defeated then they would not own the North half of Korea
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It is not possible to free North Korea without fighting China
Once the United States went North beyond a certain point China sent in troops
