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1973 agreement between North and South Vietnam and the US to end the Vietnam War
the treaties marking the official end of the Cambodian–Vietnamese War

The Paris Peace Accords , officially the Agreement on Ending the War and Restoring Peace in Viet Nam (Hiệp định về chấm dứt chiến tranh, lập lại hòa bình ở Việt Nam), was a peace agreement signed on January 27, 1973, to establish peace in Vietnam and end the Vietnam War. The agreement was signed by the governments of the Democratic Republic of Vietnam (North Vietnam); the Republic of Vietnam (South Vietnam); the United States; and the Provisional Revolutionary Government of the Republic of South Vietnam (PRG), which represented South Vietnamese communists. US ground forces had begun to withdraw from Vietnam in 1969, and had suffered from deteriorating morale during the withdrawal. By the beginning of 1972 those that remained had very little involvement in combat. The last American infantry battalions withdrew in August 1972. Most air and naval forces, and most advisers, also were gone from South Vietnam by that time, though air and naval forces not based in South Vietnam were still playing a large role in the war. The Paris Agreement removed the remaining US forces. Direct U. S. military intervention was ended, and fighting between the three remaining powers temporarily stopped for less than a day. The agreement was not ratified by the U. S. Senate. The negotiations that led to the accord began in 1968, after various lengthy delays. As a result of the accord, the International Control Commission (ICC) was replaced by the International Commission of Control and Supervision (ICCS), which consisted of Canada, Poland, Hungary, and Indonesia, to monitor the agreement. The main negotiators of the agreement were U. S. National Security Advisor Henry Kissinger and the North Vietnamese Politburo member Lê Đức Thọ. Both men were awarded the 1973 Nobel Peace Prize for their efforts, but Lê Đức Thọ refused to accept it. The agreement's provisions were immediately and frequently broken by both North and South Vietnamese forces with no official response from the United States. Open fighting broke out in March 1973, and North Vietnamese offensives enlarged their territory by the end of the year. Two years later, a massive North Vietnamese offensive conquered South Vietnam on April 30, 1975, and the two countries, which had been separated since 1954, united once more on July 2, 1976, as the Socialist Republic of Vietnam. Part of the negotiations took place in the former residence of the French painter Fernand Léger; it was bequeathed to the French Communist Party. The street of the house was named after Philippe Leclerc de Hauteclocque, who had commanded French forces in Vietnam after the Second World War.

Following the strong showing of anti war candidate Eugene McCarthy in the New Hampshire primary, in March 1968 U. S. President Lyndon B. Johnson halted bombing operations over the northern portion of North Vietnam (Operation Rolling Thunder), in order to encourage Hanoi (the perceived locus of the insurgency) to begin negotiations. Although some sources state that the bombing halt decision announced on March 31, 1968, was related to events occurring within the White House and the Presidents counsel of Secretary of Defense Clark Clifford and others rather than the events in New Hampshire. Shortly thereafter, Hanoi agreed to discuss a complete halt of the bombing, and a date was set for representatives of both parties to meet in Paris. The sides first met on May 10, with the delegations headed by Xuân Thuỷ, who would remain the official leader of the North Vietnamese delegation throughout the process, and U. S. ambassador at large W. Averell Harriman. For five months, the negotiations stalled as North Vietnam demanded that all bombing of North Vietnam be stopped, while the U. S. side demanded that North Vietnam agree to a reciprocal de escalation in South Vietnam; it was not until October 31 that Johnson agreed to end the air strikes and serious negotiations could begin. One of the largest hurdles to effective negotiation was the fact that North Vietnam and the National Front for the Liberation of South Vietnam (NLF, or Viet Cong) in the South, refused to recognize the government of South Vietnam; with equal persistence, the government in Saigon refused to acknowledge the legitimacy of the NLF. Harriman resolved this dispute by developing a system by which North Vietnam and U. S. would be the named parties; NLF officials could join the North Vietnam team without being recognized by South Vietnam, while Saigon's representatives joined their U. S. allies. A similar debate concerned the shape of the table to be used at the conference. The North favored a circular table, in which all parties, including NLF representatives, would appear to be "equal"' in importance. The South Vietnamese argued that only a rectangular table was acceptable, for only a rectangle could show two distinct sides to the conflict. Eventually a compromise was reached, in which representatives of the northern and southern governments would sit at a circular table, with members representing all other parties sitting at individual square tables around them.

Bryce Harlow, a former White House staff member in the Eisenhower administration, claimed to have "a double agent working in the White House I kept Nixon informed." Harlow and Henry Kissinger (who was friendly with both campaigns and guaranteed a job in either a Humphrey or Nixon administration in the upcoming election) separately predicted Johnson's "bombing halt". Democratic senator George Smathers informed President Johnson that "the word is out that we are making an effort to throw the election to Humphrey. Nixon has been told of it". Nixon asked prominent Chinese American politician Anna Chennault to be his "channel to Mr. Thieu"; Chennault agreed and periodically reported to John Mitchell that Thieu had no intention of attending a peace conference. On November 2, Chennault informed the South Vietnamese ambassador: "I have just heard from my boss in Albuquerque who says his boss [Nixon] is going to win. And you tell your boss [Thieu] to hold on a while longer." Johnson found out through the NSA and was enraged saying that Nixon had "blood on his hands" and that Senate Minority Leader Everett Dirksen agreed with Johnson that such action was "treason." Defense Secretary Clark Clifford considered the moves an illegal violation of the Logan Act. In response, Johnson ordered the wire tapping of members of the Nixon campaign. Dallek wrote that Nixon's efforts "probably made no difference" because Thieu was unwilling to attend the talks and there was little chance of an agreement being reached before the election; however, his use of information provided by Harlow and Kissinger was morally questionable, and vice president Humphrey's decision not to make Nixon's actions public was "an uncommon act of political decency."

After winning the 1968 presidential election, Richard Nixon became president of the U. S. in January 1969. He then replaced U. S. ambassador Harriman with Henry Cabot Lodge Jr., who was later replaced by David Bruce. Also that year, the NLF set up a Provisional Revolutionary Government (PRG) to gain government status at the talks. However, the primary negotiations that led to the agreement did not occur at the Peace Conference at all but were carried out during secret negotiations between Kissinger and Lê Đức Thọ, which began on August 4, 1969. North Vietnam insisted for three years that the agreement could not be concluded unless the United States agreed to remove South Vietnamese President Thiệu from power and replace him with someone more acceptable to Hanoi. Nixon and Kissinger were unwilling to sign an agreement to overthrow a government the NLF had failed to overthrow by force of arms, though the extent of North Vietnamese demands is contested. Historian Marilyn B. Young, contends that the contents of Hanoi's proposal were systematically distorted from their original plea to permit Thiệu's replacement, to what Kissinger propagated as a demand for his overthrow.

On May 8, 1972, Nixon made a major concession to North Vietnam by announcing that the U. S. would accept a cease fire in place as a precondition for its military withdrawal. In other words, the U. S. would withdraw its forces from South Vietnam without North Vietnam doing the same. The concession broke a deadlock and resulted in progress in the talks over the next few months. The final major breakthrough came on October 8, 1972. Prior to this, North Vietnam had been disappointed by the results of its Nguyen Hue Offensive (known in the West as the Easter Offensive), which had resulted in the United States countering with "Operation Linebacker," a significant air bombing campaign that blunted the North's drive in the South as well as inflicting damage in the North. Also, they feared increased isolation if Nixon's efforts at détente significantly improved U. S. relations with the chief communist powers, the Soviet Union and the People's Republic of China, who were backing the North Vietnamese military effort. In a meeting with Kissinger, Thọ significantly modified his bargaining line, allowing that the Saigon government could remain in power and that negotiations between the two South Vietnamese parties could develop a final settlement. Within 10 days the secret talks drew up a final draft. Kissinger held a press conference in Washington during which he announced that "peace is at hand." When Thiệu, who had not even been informed of the secret negotiations, was presented with the draft of the new agreement, he was furious with Kissinger and Nixon (who were perfectly aware of South Vietnam's negotiating position) and refused to accept it without significant changes. He then made several public radio addresses, claiming that the proposed agreement was worse than it actually was. Hanoi was flabbergasted, believing that it had been duped into a propaganda ploy by Kissinger. On October 26, Radio Hanoi broadcast key details of the draft agreement. However, as U. S. casualties had mounted throughout the conflict since 1965, American domestic support for the war had deteriorated, and by late 1972 there was major pressure on the Nixon administration to withdraw from the war. Consequently, the U. S. brought great diplomatic pressure upon their South Vietnamese ally to sign the agreement even if the concessions Thiệu wanted could not be achieved. Nixon pledged to provide continued substantial aid to South Vietnam and given his recent landslide victory in the presidential election, it seemed possible that he would be able to follow through on that pledge. To demonstrate his seriousness to Thiệu, Nixon ordered the heavy Operation Linebacker II bombings of North Vietnam in December 1972. Nixon also attempted to bolster South Vietnam's military forces by ordering that large quantities of U. S. military material and equipment be given to South Vietnam from May to December 1972 under Operations Enhance and Enhance Plus. These operations were also designed to keep North Vietnam at the negotiating table and to prevent them from abandoning negotiations and seeking total victory. When the North Vietnamese government agreed to resume "technical" discussions with the United States, Nixon ordered a halt to bombings north of the 20th parallel on December 30. With the U. S. committed to disengagement (and after threats from Nixon that South Vietnam would be abandoned if he did not agree), Thiệu had little choice but to accede. On January 15, 1973, Nixon announced a suspension of offensive actions against North Vietnam. Kissinger and Thọ met again on January 23 and signed off on an agreement that was basically identical to the draft of three months earlier. The agreement was signed by the leaders of the official delegations on January 27, 1973, at the Hotel Majestic in Paris.

According to Finnish historian Jussi Hanhimäki, due to triangular diplomacy which isolated it, South Vietnam was "pressurized into accepting an agreement that virtually ensured its collapse". During negotiations, Kissinger stated that the United States would not intervene militarily 18 months after an agreement, but that it might intervene before that. In Vietnam War historiography, this has been termed the "decent interval".