Question

what was the name of the theory that said that if one country in a region fell to communism, others would surely follow?
○ domino theory
○ arms race
○ brinkmanship
○ containment theory

Explanation:

The domino theory is the Cold War-era idea that if one country in a region became Communist, adjacent countries would fall to Communism in a chain reaction, like dominoes toppling. The other options do not match: arms race refers to competing weapons buildup, brinkmanship is risky diplomatic posturing, and containment theory focused on stopping Communist expansion without the domino chain premise.

Answer:

domino theory