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.
Case–Church Amendment
The Case–Church Amendment was legislation attached to a bill funding the U.S. State Department. it was approved by the U.S. Congress in June 1973 that prohibited further U.S. military activity in Vietnam, Laos and Cambodia unless the president secured Congressional approval in advance. This ended direct U.S. military involvement in the Vietnam War, although the U.S. continued to provide military equipment and economic support to the South Vietnamese government. It is named for its principal co-sponsors, Senators Clifford P. Case (R-NJ) and Frank Church (D-ID). The Amendment was defeated 48–42 in the U.S. Senate in August 1972, but revived after the 1972 election. It was reintroduced on January 26, 1973 and approved by the Senate Foreign Relations Committee on May 13. When it became apparent that the Amendment would pass, President Richard Nixon and Secretary of State Henry Kissinger, lobbied frantically to have the deadline extended. However, under pressure from the extreme scrutiny of Watergate, Republicans relented on support for Vietnam and the amendment passed the United States Congress in June 1973 by a margin of 325–86 in the House, 73–16 in the Senate. Both of these margins for the amendment's passage were greater than the two-thirds majority required to override a presidential veto, and Nixon signed it on July 1, 1973. Although U.S. forces had been withdrawn from South Vietnam earlier pursuant to the Paris Peace Accords, air support and monetary support for Cambodia and Laos continued until August 15, 1973, the deadline set by the Amendment.