The correct answer to this open question is the following.
Unfortunately, you forgot to include the options for this question.
However, trying to help you we can comment on the following.
"You have a row of dominoes set up, you knock over the first one, and what will happen to the last one is the certainty that it will go over very quickly. So you could have a beginning of a disintegration that would have the most profound influences."
What point is President Eisenhower making here with his domino analogy?
The correct answer is "North Vietnam installed communist governments in Cambodia and Laos."
The domino effect establishes that one action generates a consequence that affects other actions that again generate another consequence to the ultimate consequence of the first action generated. In simpler words is a change reaction that produces a series of similar events.
That is why United States President Dwight Eisenhower was worried about the spread of Communism in different parts of the World during the Cold War years. That is when he set the example of the "domino effect."
As a consequence of this, the United States established the policy of containment to stop the spread of Communism and decided to support the government of South Vietnam.
