History of the United States (1964–1980)
The growing Watergate scandal was a major disaster for Nixon, eroding his political support in public opinion and in Washington. However he did manage to secure large-scale funding for South Vietnam, much of which was wasted. The United States withdrew its troops from Vietnam before the Paris Peace Accords in 1973. However, Watergate resulted in significant Democrat gains in the 1974 midterm elections and when the new 94th Congress convened the following January, it immediately voted to terminate all aid to South Vietnam in addition to passing a bill forbidding all further US military intervention in Southeast Asia. President Ford was against this, but as Congress had a veto-proof majority, he was forced to accept. South Vietnam rapidly collapsed as the North invaded it in force, and Saigon fell to the NVA on April 30, 1975. Later nearly one million Vietnamese managed to flee to the U.S. as refugees. The impact on the U.S. was muted, with few political recriminations, but it did leave a "Vietnam Syndrome" that cautioned against further military interventions anywhere else. Nixon (and his next two successors Ford and Carter) had dropped the containment policy and were not willing to intervene anywhere.
Marxism–Leninism
The Vietnam War (1945–1975) was the second East–West war that occurred in Asia during the Cold War. After the Vietnamese Communists led by Ho Chi Minh defeated the French re-establishment of European colonialism in Viet Nam, the United States replaced France as the Western support of the client-state Republic of Vietnam (1955–1975). Despite military superiority, the United States failed to safeguard South Vietnam from the Viet Cong, the guerrilla army sponsored by North Vietnam. In 1968, North Vietnam launched the Tet Offensive. Although a military failure, the attack was successful psychological warfare that decisively turned international public opinion against the United States intervention to the Vietnamese civil war and five years later eventual United States withdrawal from the war in 1973 and the subsequent Fall of Saigon to the Vietnamese Communists forces in 1975.