What was the role of the u. s. in the vietnam conflict?

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.