The united states became involved in the vietnam war in order to.. a. colonize southeast asia. b. begin nuclear-weapons testing. c. prevent the takeover of south vietnam by communist north vietnam. d. prevent the takeover of north vietnam by communist south vietnam.

The United States involved in the Vietnam War to prevent the takeover of South Vietnam by communist North Vietnam.

Option (c)

Explanation:

The U.S troops entered into the "Vietnam War" to prevent the communist activities and to help french in the war. Domino Theory was one of the reasons for the involvement of the U.S in the "Vietnam war".

This theory states that communism would spread if Vietnam became a communist. Nearly 16000 Americans were sent to Vietnam for supporting South Vietnam troops.

the answer is b. hope this !