Which event took place in 1950 and had the greatest impact on the course of the korean war? a) china entered the war in defense of north korea. b) truman declared an end to us involvement and pulled out all troops. c) united states forces captured the north korean capital of pyongyang. d) the united nations demanded that north korean troops withdraw from south korea.

A)China entered the war in defense of North Korea.

Explanation:

When China entered the war in defense of North Korea, it changed the course of the Korean War. The United States had almost defeated North Korea when China entered the war and drove US forces back past the 38th parallel. The United States and China stayed in a battle at that boundary line until a ceasefire was struck.

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explanation:

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