The Vietnam War was perhaps the largest armed conflict between the West and the East during the Cold War. Theoretically, the battle was between the North Vietnamese Army and South Vietnamese Army. In fact, it was a war between representatives of the US and the USSR (Soviet Union), although the USSR was not directly involved in military action.
The North Vietnamese army was supported by the Soviet Union, China and other Communist allies, and the South Vietnamese army was supported by the United States, South Korea, Australia, Thailand and other anti-communist allies.
It lasted from November 1, 1955 to April 30, 1975 (nearly 20 years) and took place in South Vietnam, North Vietnam, Cambodia and Laos.
The result was the victory of North Vietnam, the withdrawal of American-led forces from Indochina and communist governments took power in South Vietnam, Cambodia and Laos. Finally, South Vietnam was annexed by North Vietnam (reunification of North and South Vietnam into the Socialist Republic of Vietnam).