Question

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

A. domino theory
B. arms race
C. brinkmanship
D.containment theory

Answer 1

The name of the theory that said "if one country in a region fell to Communism, others would surely follow." is called the domino theory. In the game dominos, if one falls, they all fall after in a sequence. The correct answer A. 

Answer 2

The answer is: A. domino theory

This theory was popularized by president Eisenhower. according to him, communists countries impose a strong military dictatorships in their territories. This mean that if these communists countries were left unintervined , they would gradually conquered other countries like dominos as they gained more influence.