because it was north Vietnam against south Vietnam
South Vietnam was considered an ally of the US.
The U.S. defeat in Vietnam was considered a failure for the policy of containment. (if your doing study island "Korean and Vietnam war)
Vietnam War
You are a Vietnam Era Veteran but not a Vietnam War Veteran
It wasn't "unsuccessful" according the communists; they won the war.
The Vietnam War is considered an American loss. Its purpose was to prevent North Vietnam from becoming a Communist government, and this effort proved unsuccessful.
The Vietnam War might have been avoided, if communism had not been involved.
Montagnard and Vietnamese; The Montagnards (French for Mountaineer/Mountain People) were considered (during the war) to be the original inhabitants of Vietnam. The Vietnamese were considered (during the war) to be immigrants from Ancient China.
The Vietnam War happened in the 1960's and throughout the 60's. The Vietnam War is considered to be one of the most pointless wars in US history.
Vietnam War
Battle for saigon