Answer: The main reason for America sending combat troops to Vietnam in 1965, was to follow the Truman Doctrine and contain Communism, the Americans strongly believed in the Domino theory.
Question and Answer:
Why did the United States send troops to Vietnam? Well, The main reason for America sending combat troops to Vietnam in 1965, was to follow the Truman Doctrine and contain Communism, the Americans strongly believed in the Domino theory.