answers: 1970
context: U.S. assistance. The negotiations stalled, however, when the Vietnamese responded that they would neither agree to establish relations nor furnish information on U.S. POW/MIAs until the United States pledged to provide several billion dollars in postwar reconstruction aid. Simultaneously, Congress objected to Carter's moves by reinforcing existing prohibitions on aid to Vietnam. Normalization efforts ultimately were thwarted in 1978 by Vietnam's decision to align with the Soviet Union, its invasion of Cambodia, and its expulsion of nearly half a million ethnic Chinese who then became refugees in Southeast Asia. Washington and Hanoi gradually began to normalize relations in the early </s> stand-down period, never used the STD in a strategic reconnaissance role. Instead, the STD's units were launched on in-country missions until the dissolution of their parent organization in March 1973. In January 1973, President Nixon ordered a halt to all U.S. combat operations in South Vietnam and, on the 27th of that month, the Paris Peace Accords were signed by the belligerent powers in Paris. On 21 February, a similar accord was signed on Laos, ending the bombing of that country and instituting a cease fire. On the 29th, MACV was disestablished and remaining U.S. troops began leaving the south. </s> movement, some veterans joined Vietnam Veterans Against the War. On 15 October 1969, the Vietnam Moratorium attracted millions of Americans. The fatal shooting of four students at Kent State University in 1970 led to nationwide university protests. Anti-war protests declined with the final withdrawal of troops after the Paris Peace Accords in 1973. In 1950, China extended diplomatic recognition to the Viet Minh's Democratic Republic of Vietnam and sent heavy weapons, as well as military advisers led by Luo Guibo to assist the Viet Minh in its war with the French (1946-1954). The first draft of the 1954 Geneva Accords
question: when did the us leave the vietnam war