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.
Vietnam War
U.S. President Richard Nixon began troop withdrawals in 1969. His plan, called the Nixon Doctrine, was to build up the ARVN, so it could take over the defense of South Vietnam. The policy became known as "Vietnamization". Theater commander Creighton Abrams shifted to smaller operations, aimed at disrupting logistics, with better use of firepower and more cooperation with the ARVN. On 27 October 1969, Nixon had ordered a squadron of 18 B-52s loaded with nuclear weapons to race to the border of Soviet airspace to convince the Soviet Union, in accord with the madman theory, that he was capable of anything to end the Vietnam War ("Operation Giant Lance"). Nixon had also sought détente with the Soviet Union and rapprochement with China, which decreased global tensions and led to nuclear arms reduction on the part of both superpowers; however, there was disappointment when both sides continued to supply the North Vietnamese with aid.