On March 29, 1973, two months following the Paris Peace Accords, the U.S. pulled the last of its troops out of Vietnam. How long after the troop pull-out did the South Vietnam capital of Saigon fall to the forces of North Vietnam?

The United States, South Vietnam, Viet Cong, and North Vietnam formally sign "An Agreement Ending the War and Restoring Peace in Vietnam" in Paris. Due to South Vietnam's unwillingness to recognize the Viet Cong's Provisional Revolutionary Government, all references to it were confined to a two-party version of the document signed by North Vietnam and the United States -- the South Vietnamese were presented with a separate document that did not make reference to the Viet Cong government. This was part of Saigon'€™s long-time refusal to recognize the Viet Cong as a legitimate participant in the discussions to end the war.

The settlement included a cease-fire throughout Vietnam. It addition, the United States agreed to the withdrawal of all U.S. troops and advisors (totaling about 23,700) and the dismantling of all U.S. bases within 60 days. In return, the North Vietnamese agreed to release all U.S. and other prisoners of war. ...

In reality, however, the agreement was little more than a face-saving gesture by the U.S. government. Even before the last American troops departed on March 29, the communists violated the cease-fire, and by early 1974 full-scale war had resumed. At the end of 1974, South Vietnamese authorities reported that 80,000 of their soldiers and civilians had been killed in fighting during the year, making it the most costly of the Vietnam War.

On April 30, 1975 Saigon fell to North Vietnam