“You have a row of dominoes set up, you knock over the

first one, and what will happen to the last one is the cer-

tainty that it will go over very quickly.” President Dwight Eisenhower

How did the theory represented in the quote above impact the United States’ policy in Korea and Vietnam?

A.
It led directly to the United States’ involvement in Korea and Vietnam to prevent the spread of Communism.

B.
It led directly to the United States’ decision to pull its combat troops out of Vietnam in 1973.

C.
It led the United States to insist on a coalition of allies to fight the war so the US did not have to get involved.

D.
It led the United States to hope that if North Vietnam became a democracy, other countries would follow.