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The signing of the Paris Peace Accords is seen as the event that marked the end of U.S. involvement in the Vietnam War. This agreement, signed in January 1973, established terms for the withdrawal of American troops and sought to bring about a ceasefire between North and South Vietnam. It aimed to facilitate the return of American prisoners of war and laid the groundwork for future negotiations between the two Vietnamese governments.

While the fall of Saigon in April 1975 occurred after the signing of the accords, it represented the definitive end of the war as North Vietnamese forces captured the capital of South Vietnam, effectively unifying the country under communist control. However, this event did not involve U.S. military participation, as American forces had already withdrawn.

The Tet Offensive was a major turning point in the war, occurring in 1968, and it shifted U.S. public opinion against the war, but it did not signify the conclusion of U.S. involvement. The Gulf of Tonkin Resolution, passed in 1964, granted President Johnson broad authority to engage in military action in Vietnam but preceded the actual U.S. involvement that culminated in the conflict.

Thus, the Paris Peace Accords officially signified the transition to the withdrawal of