Discounting the supplying nations (USSR/Red China): 1 against 7.
War in RVN (South Vietnam) since 1955. War with North Vietnam since 1964.
The US and North Vietnam. US jets bombed the north; the north shot them down. (Back and forth; back and forth).
After the war, there was a reunification of Vietnam. So the answer is "One country".
See the website on the: Korean War. It will show a list of countries involved with the war.
North Vietnam and South Vietnam. Also, to name just a few: the USA, China, Russia, South Korea, Australia, France, and England. A great many countries fought in the Vietnam War from 1945 to 1975.
Vietnam , America , and Russia
The Vietnam War was part of the cold war. The cold war was between governments (Nations/Countries).
because different countries were England's friends ( meaning helping us) but now most countries are not are friends like France
North Vietnam/VC vs allies
North Vietnam won them.
The countries that were actually "physically" involved, and were bombed or had US aircraft crash into them, whether they were "officially" in the war or not, were: Lao's, Cambodia, North Vietnam and South Vietnam.
The Soviet Union (USSR) supplied North Vietnam, and the US fought for South Vietnam.