1965 for the americans although conflicts started in 1959
The war officially started in 1959 but the United States didn't get involved until 1963.
All were officially neutral.
Officially no.
war
Officially not used.
Laos was officially neutral.
1955 South Vietnam.
The Vietnam War.
It didn't, Cambodia was officially neutral.
What year did the vietnam war start
See website: Vietnam War
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.