Presuming you mean the government supported by the US: The Republic of South Vietnam.
SOUTH Vietnam was called the "REPUBLIC of South Vietnam." Everyone in those days just called North Vietnam...NORTH VIETNAM.
Not many because most of the communist troops were from the north. Take my word cas I am vietnamese if you can't tell by my name
The Republic of Vietnam
Vietnam has a communist government.Communism is a social structure in which classes are abolished and property is commonly controlled, as well as a political philosophy and social movement that advocates and aims to create such a society.
I think the answer you want may be ARVN (Army of the Republic of Vietnam). It is pronounced and sometimes spelled as "Arvin."
Vietnam has never had a democratic government, so nothing has ever happened to this non-existent entity. If you are referring to the Republic of Vietnam (often called South Vietnam), which was a regime in the south of Vietnam from 1954-1975, this country was not a democracy. Although it has the word "Republic" in its name, it was really a state ruled by a strongman who was deeply beholden to US interests. As for what happened to this country, when the US withdrew military forces from Vietnam in 1973, the North Vietnamese Army overran the defenses of South Vietnam and conquered the country, bringing Vietnam into united Communist rule.
Vietnamization
Ho Chi Minh was prime minister of North Vietnam. He was important because he was the leader of the primary country we were fighting.Understanding the VC is going to take some explaining. In Vietnam there were four main armies. First were the Army of the Republic of Vietnam and the People's Army of Vietnam. The US referred to the PAVN as the NVA - North Vietnamese Army. Next were the various foreign armies in the conflict on both sides. And finally was the National Liberation Front - which were South Vietnamese citizens attempting to overthrow the South Vietnamese government. "Cong" is Vietnamese for communist, so the US called the NLF the Viet Cong. The Hanoi government controlled the NLF through an agency the US called the Central Office for South Vietnam, or COSVN. (The official Vietnamese name is long and grandiose.) Now here's where it gets fun: COSVN, although it ran the war in South Vietnam, was not in Vietnam - it was in Mimot Province, Cambodia.The importance of the VC was that it was providing the lion's share of Communist combat troops in South Vietnam.
Saigon.
In many sources, it is just called " Nixon's Secret Plan to End the Vietnam War". A more formal name was Vietnamization. Nixon wanted to transfer all military responsibilities to South Vietnam so the US could withdraw its troops.