Final answer:
The US first got involved in the Vietnam conflict by providing economic and limited military aid to South Vietnam.
Step-by-step explanation:
The US first got involved in the Vietnam conflict by providing economic and limited military aid to South Vietnam, which was fighting against the communist forces in North Vietnam. The US government believed in a policy called the Domino Theory, which stated that if one country in Southeast Asia fell to communism, then neighboring countries would also fall like dominos. So, they supported the South Vietnamese government in order to prevent the spread of communism.
Learn more about US involvement in the Vietnam conflict