Ngo Dinh Diem was selected to lead the government in South Vietnam by the U.S in 1955. Diem regime was strongly anti-communism and French connection. He was one of the few prominent Vietnamese nationalist who could claim both attributes.
The period from 1963 to 1969 is the most severe phase of Vietnam War. The U.S President, Lyndon B. Johnson had to deal with many explosive situations of Vietnamese communists. The escalation of the U.S in Vietnam War caused the uprising of communists.