McCarthyism is the answer because it caused by Senator McCarthy who feared communism would spread so that was the term it was given.
Communist northern Korea invaded non-communist southern korea, and the U.S. intervened because they hate everything communist and because southern Korea was an ally; this was the first hot war of the Cold War
Answer:
to undermine the anticommunist Diem government in South Vietnam.
Explanation:
^^
The correct answer to your wonderful question would be D. All of the above
Have a marvelous day!