How did the domino theory influence the United States' role in the Vietnam War?

A)

Vietnamization became the new U. S. foreign policy.

B)

The United States adopted a position of neutrality.

C)

It forced the United States to support the Vietcong.

D)

It convinced the government to become involved in the war.

The correct answer among the choices provided is option D. Domino Theory convinced the government to become involved in the war. The Domino Theory is a speculation wherein if a nation is under communism, the surrounding countries will become communists as well. This was used by the United States to justify the American interventions during the Cold War.

The Domino Theory (D) convinced the government to become involved in the war.