The United States feared that if communism was successful on Vietnam, the rest of the countries that border it would soon turn into communism and those other countries that border that new communist country would also be converted to communism and so on. This is called the "domino theory" and made the United States to send troops to prevent the theory from happening.
Answer is A.
it is the definition
Answer: If it's in your opinion, then no. But if it's somebody else's opinion that you don't agree with, then you do have to cite your sources.
I hope that makes sense!
Answer:
C. To limit the authority of the federal government.
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