Saigon, capital city of South Vietnam, fell to North Vietnamese forces on April 30th1975. The fall of Saigon (now Ho Chin Minh City) effectively marked the end of the Vietnam War. After the introduction of Vietnamisation by President Richard Nixon, US forces in South Vietnam had been constantly reduced leaving the military of South Vietnam …

http://www.historylearningsite.co.uk/vietnam-war/the-fall-of-saigon/