When did north and south Vietnam join together?

The official establishment of the single republic of Vietnam occurred on July 2, 1976. The Vietnamese name of the unified republic is "Cong hòa xã hoi chu nghĩa Viet Nam".

The forces of North Vietnam captured Saigon, the capital of the South, on April 30, 1975, a day after the evacuation of the US Embassy on April 29. This marked the end of the Vietnam War, which began with the partition of the former French colony in 1956. The military conquest of South Vietnam became inevitable with the withdrawal of US combat forces under the 1973 Paris Peace Accords, completed on March 29, 1973.