US strategy was primarily based upon "attritition", which resulted in the tactics of "Search and Destroy". A function which required the counting of enemy bodies, which in turn created the term, "body count". The Vietnam War, became a war of body counts.
North Vietnam/VC vs allies
Vietnam was fighting in the war with Russia, and Russia was battling the British men.
The anti-communist countries fighting the communists in the war, were: The US, Australia, New Zealand, Philippines, Thailand, South Korea, and South Vietnam.
Air war North Vietnam. Ground war South Vietnam.
Part of the cold war.
We were fighting for our freedom but America was the biggest threat to the communist countries
South Vietnam
No.
people
NVA and VC.
Both were aimed at containment of communist expansion.
After the war, there was a reunification of Vietnam. So the answer is "One country".