How did the Vietnam War end for the U. S. and the Vietnamese?

January 27, 1973: President Nixon signs the Paris Peace Accords, ending direct U.S. involvement in the Vietnam War. The North Vietnamese accept a cease fire. But as U.S. troops depart Vietnam, North Vietnamese military officials continue plotting to overtake South Vietnam

Explanation:

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roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.