When the United Nations forces drew too close to the North Korean northern border,which nation attacked them?

Name: When the United Nations forces drew too close to the North Korean northern border,which nation attacked them?
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Question

Quizplus · Accepted Answer

As the United Nations forces neared the North Korean northern border, Chinese forces intervened and crossed the Yalu River to the aid of the North Koreans, resulting in a significant shift in the direction of the war.

When the United Nations Forces Drew Too Close to the North