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:

This theory was a key Cold War concept, arguing that communist expansion in one country would trigger a chain reaction of neighboring countries falling to communism, analogous to dominoes toppling. The other options do not match: arms race refers to competitive weapons buildup, brinkmanship is risky diplomatic posturing, and containment theory focused on stopping communist spread without the domino chain premise.

Answer:

domino theory