Answer:
Increased American involvement in Vietnam.
Step-by-step explanation:
The U.S. involvement in Vietnam began in 1954, through ongoing conflict in the region of North and South. South Vietnam wanted to remain close ties with the West. Ngo Dinh Diem as a President in South Vietnam, it became possible for the U.S. to fight and overthrow Communism.
Both the presidents Truman and Eisenhower defended French support in Vietnam by providing economic aid.
The Domino effect raised in foreign policy during the Presidency of Kennedy and Johnson to support America's military involvement in the Vietnam War.
There were more than 16,000 U.S. advisers in South Vietnam during Kennedy presidency.