After the war, there was a reunification of Vietnam. So the answer is "One country".
At least six other nations.
The nation of North Vietnam (which no longer exists...it's called Vietnam today). The country that the US was allied to, South Vietnam, doesn't exist either...it was consumed by North Vietnam. The official name of SOUTH Vietnam was the "Republic of South Vietnam."
Vietnam was split into two countries during the vietnam war, the north was ruled by Ho Chi Minh and the South by Ngo Diem.
No. The U.S. lost the Vietnam War, as the communist North Vietnam succeeded in taking over South Vietnam (which the U.S. was allied with), and united the country as one Vietnam.
Vietnam is now a communist country that functions like most other countries.
The nation (country) of Vietnam didn't exist during the Vietnam War. Nor was any nation called "Vietnam" fighting the US. There was a country called North Vietnam that defeated the Republic of South Vietnam in 1975. The US was allied to the RVN (Republic of South Vietnam).
Two separate countries: South Vietnam was officially called RVN (Republic of South Vietnam). When US servicemen landed in country, they were greeted with "Welcome to the Republic of South Vietnam" (enjoy your stay).
russia
Each country had a secret alliance with maybe four or five other countries. so if one country declared war on another their allied countries would have to declare war as well.
Germany
In 1948 in Korea, the Communists controlled the northern half of the country and the US-Allied Capitalist Dictators controlled the southern half of the country. After the Korean War in 1953, this situation was preserved. In the 1980s, the Capitalist Dictators in the south gave way to a democracy.In 1954 in Vietnam, the Communists controlled the northern half of the country and the US-Allied Capitalist Dictators controlled the southern half of the country. After the Vietnam War in 1975, the Communists were able to unite the entire country and remain in power to this day.