Chinese Communists saw the advancement of the UN troops into North Korea as a threat. The goal of the UN was to unify Korea.
By January 1951, Communists had captured Seoul, South Korea's capital.
Truman wanted to negotiate an end to the fighting, but MacArthur wanted to drop atomic bombs. Truman disagreed.
In April 1951, MacArthur was removed, causing an uproar, because for his popularity. General MacArthur dramatically left, with polls against the President.
Negotiators finally reached a cease-fire agreement in July 1953, during the presidency of Dwight D. Eisenhower.
The United States had shown the Soviets that it was willing to use force to block the spread of communism.