Only North Vietnam.
South Vietnam had communists living in it; the Viet Cong.
Communist China supplied material and technicians/as did the USSR.
Soviet East European satellites also supplied war material.
Cuba supplied some technicians.
The French fought the Vietnamese Communists from 1946 until 1954, this was the first Indo-China War or the French War. The US fought the Second Indo-China War or the Vietnam War 1961-1975 (or 1961-1973). The Viet Communists won them both.
Vietnamese Communists (Viet Cong) vs. the South Vietnamese Army and the US. Many other countries supported but the main ones are above
Each other: North against South. north fought to get rid of communism while the south fought to stay communists
North Vietnam fought alone (other than South Vietnamese communists known as the VC). North Vietnam was supplied by USSR/Communist China with war equipment.
The Soviet Union (USSR) supplied North Vietnam, and the US fought for South Vietnam.
The United States entered the Vietnam conflict to prevent Southeast Asian countries from falling to the Communists.
Vietnam has never had a civil war. The closest you could get would be the Vietnam War, which was fought between the separate although related countries of North and South Vietnam (along with the allies of each side).
Yes, they (the communists) won the war.
Both wars were fought during the cold war against communist aggression. The communists lost the Korean War but won the Vietnam War. Another words the Republic of South Korea exists today; the Republic of South Vietnam does not.
The Communists and The United States, France and maybe Britain (not sure about Britain)Allies vs NVA/VC
The communists.
What war for the first? Communists won the war in Vietnam.