ANSWER:
The main role for which the U.S. entered into the Vietnam conflict was to end the communism in Vietnam.
EXPLANATION:
- U.S provided the assist in the military and financial aspect to the Vietnam during the war.
- The U.S nation helped through every aspect to prevent the Vietnam from adopting the communist rule.
- Hence the main role of U.S was to prevent the communism by providing the military and financial support to them Vietnam during the conflict.
