Why did the u. n forces ( mostly Americans ) get pushed back across the 38th parallel

Because Communist China entered the war on North Korea's side.

Explanation:

However, as the Americans moved north toward the Yalu River, the border between North Korea and Communist China, their advance was halted when China entered the fray that fall. In late November, a massive force of Chinese troops sent the Allies into retreat. In early January 1951, the Communists recaptured Seoul, only to have the Allies reoccupy it in March.

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question- above

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