When u. s. troops left south vietnam what happened to that region

South Vietnam was forcibly reunited with North Vietnam and became a single communist nation.

Explanation:

Newly elected President Richard M. Nixon declared in 1969 that he would continue the American involvement in the Vietnam War in order to end the conflict and secure "peace with honor" for the United States and for its ally, South Vietnam. Unfortunately, Communist North Vietnam's leaders, believing that time was on their side, steadfastly refused to negotiate seriously. Indeed, in March 1972 they attempted to bypass negotiations altogether with a full-scale invasion of the South. Called the Easter Offensive by the United States, the invasion at first appeared to succeed. By late summer, however, Nixon's massive application of American airpower blunted the offensive. At this point, the North Vietnamese began to negotiate in earnest. In early October, American and North Vietnamese representatives met in Paris. By October 11, they had hammered out a peace agreement. Its key elements were: all parties would initiate a cease-fire in place 24 hours after signing the agreement; U.S. forces and all foreign troops would withdraw from South Vietnam no later than 60 days after signing the agreement; American prisoners would be released simultaneously with the withdrawal of American and foreign forces, and a National Council of National Reconciliation and Concord would be created to organize and oversee free and democratic elections to determine the political future of the South.

The agreement represented a victory for the North Vietnamese but also it seemed to provide an honorable way out for the Americans. Nixon quickly approved the terms. On October 22, however, South Vietnamese President Nguyen Van Thieu stopped the process in its tracks. Especially infuriating to him was the cease-fire in place. It left thousands of North Vietnamese soldiers in South Vietnam (estimates ranged from 140,000 to 300,000) well-positioned to continue the war when the Americans departed.

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