Which of these was used to justify U.S. support for South Vietnam? internationalism McCarthyism the domino theory the nuclear arms race

Respuesta :

Answer:

The domino effect.

Explanation:

The Domino effect is the theory that when one country falls to communism then more will soon follow, one by one. This is what got us into the Cold War and all conflicts surrounding it, including the Korean and Vietnam War.

Answer:

domino

Explanation: