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Which was a major effect of the cold war on the United States in the 1950s?

ACongress passed laws prohibiting United States contact with communist countries.
BThe United States refused to enter military alliances with other nations.
CParticipation, or even past participation, in extremist movements was viewed as un-American.
DAmericans were required to take loyalty oaths before registering to vote.

Verified Answer :

The correct answer for the question that is being presented above is this one: "c. Participation, or even past participation, in extremist movements was viewed as un-American." The major effect of the cold war on the United States in the 1950s is that the participation, or even past participation, in extremist movements was viewed as un-American.