Which event officially ended the U.S. military’s involvement in Vietnam?

The signing of the Treaty of Paris is the correct answer because it formally concluded the Vietnam War and stipulated the terms under which the United States would withdraw its forces from Vietnam. Signed on January 27, 1973, the treaty included provisions for a ceasefire and the withdrawal of U.S. troops, marking an official end to military involvement in Vietnam. This agreement aimed to restore peace in Vietnam and allowed for the return of American prisoners of war.

The Fall of Saigon, while significant and representing the effective end of the war in practice, occurred later on April 30, 1975. It symbolized the collapse of the South Vietnamese government and the finality of the conflict, but it was not the official end recognized through diplomatic agreements.

The Tet Offensive, which took place in early 1968, was a major campaign by North Vietnamese and Viet Cong forces aimed at striking a blow against the U.S. and South Vietnamese forces. Though it significantly impacted public opinion in the U.S. regarding the war, it did not mark the end of military involvement.

The Gulf of Tonkin Resolution was a measure passed by Congress in 1964, which granted President Lyndon B. Johnson the authority to increase U.S. military presence in Vietnam