What was the name of the theory that said if one country in a region fell to communism, others would surely follow ?

a) domino theory
b) arms race
c) brinkmanship
d) containment theory

The domino theory was a theory used from the 1950s to the 1980s that stated "if one country falls to communism, then the surrounding countries would fall to communism."

Thus, the correct answer is a) domino theory.

I hope this helped!

- three-quarters or two-thirds..

- "the constitution provides that an amendment may be proposed either by the congress with a two-thirds majority vote in both the house of representatives and the senate or by a constitutional convention called for by two-thirds of the state legislatures."

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i also think he is correct. i believe they came to washington to protest their rights.