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South Vietnam was overrun by communist forces.
Communist North Vietnam re-united with the NON-Communist SOUTH Vietnam, creating ONE Communist country; Vietnam.
Communist North Vietnam was trying to take over the non-communist country of South Vietnam. The US fought North Vietnam to stop them.
To prevent the communist take over of the NON-communist Republic of South Vietnam, by Communist NORTH Vietnam.
To stop communist North Vietnam from taking over the non-communist country of South Vietnam.
RVN=Republic of South Vietnam, a democracy.
Communist infiltration into South Vietnam.
Preventing Communist North Vietnam from taking over the Free Non communist country of South Vietnam.
A war to preserve the Free Republic of South Vietnam from a communist take over by Communist NORTH Vietnam.
Containing it=Keeping it from spreading. Example 1: Keeping Communist North Vietnam from conquering South Vietnam; which failed (South Vietnam was consumed by communist North Vietnam). Example 2: Keeping Communist North Korea from conquering South Korea; which succeeded (South Korea was preserved).
To defend South Vietnam from the oppression of the Communist North Vietnam.
became Communist and reunited with North Vietnam