Détente (French pronunciation: [detɑ̃t], meaning "relaxation") is the easing of strained relations, especially in a political situation. The term originates in the time of the Triple Entente and Entente cordiale in reference to an easing of tensions between England and France who, subsequent to being commingled polities under Norman rule, were warring rivals for the better part of a millennium but pursuant to a policy of détente became enduring allies.
In the context of the Cold War, the lessening of tensions between the East and West, along with domestic reform in the Soviet Union, worked together to achieve the end of communism in Eastern Europe and eventually the Soviet Union altogether.
The term is most often used in reference to a period of general easing of the geo-political tensions between the Soviet Union and the United States; it was the distinct lessening of the Cold War. It began in 1969, as a core element of the foreign policy of U.S. president Richard Nixon, in an effort to avoid the collision of nuclear risks. The Nixon administration promoted greater dialogue with the Soviet government, including regular summit meetings and negotiations over arms control and other bilateral agreements. Détente was known in Russian as разрядка (razryadka, loosely meaning "relaxation of tension").
The period was characterized by the signing of treaties such as SALT I and the Helsinki Accords. Another treaty, START II, was discussed but never ratified by the United States. There is still ongoing debate amongst historians as to how successful the détente period was in achieving peace.
After the Cuban Missile Crisis of 1962, the two superpowers agreed to install a direct hotline between Washington D.C. and Moscow (the so-called red telephone), enabling leaders of both countries to quickly interact with each other in a time of urgency, and reduce the chances that future crises could escalate into an all-out war. The U.S./U.S.S.R. détente was presented as an applied extension of that thinking. The SALT II pact of the late 1970s continued the work of the SALT I talks, ensuring further reduction in arms by the Soviets and by the U.S. The Helsinki Accords, in which the Soviets promised to grant free elections in Europe, has been called a major concession to ensure peace by the Soviets.
Détente ended after the Soviet intervention in Afghanistan, which led to the United States boycott of the 1980 Olympics in Moscow. Ronald Reagan's election as president in 1980, based in large part on an anti-détente campaign, marked the close of détente and a return to Cold War tensions. In his first press conference, President Reagan said "Détente's been a one-way street that the Soviet Union has used to pursue its aims."
Summits and treaties
The most obvious manifestation of détente was the series of summits held between the leaders of the two superpowers and the treaties that resulted from these meetings. In the early 1960s, before détente, the Partial Test Ban Treaty had been signed on August 5, 1963. Later in the decade, the Outer Space Treaty, in January 1967, and the Nuclear Non-Proliferation Treaty, July 1968, were two of the first building blocks of détente. These early treaties were signed all over the globe.
The most important[according to whom?] treaties were not developed until the Nixon Administration came into office in 1969. The Political Consultative Committee of the Warsaw Pact sent an offer to the West,[who?] urging them to hold a summit on "security and cooperation in Europe". The West agreed and talks began towards actual limits in the nuclear capabilities of the two superpowers. This ultimately led to the signing of the SALT I treaty in 1972. This treaty limited each power's nuclear arsenals, though it was quickly rendered out-of-date as a result of the development of MIRVs. In the same year that SALT I was signed, the Biological Weapons Convention and the Anti-Ballistic Missile Treaty were also concluded. Talks on SALT II also began in 1972.
In 1975, the Conference on Security and Cooperation in Europe met and produced the Helsinki Accords, a wide-ranging series of agreements on economic, political, and human rights issues. The CSCE was initiated by the USSR, involving 35 states throughout Europe. Among other issues, one of the most prevalent and discussed after the conference was that of human rights violations in the Soviet Union. The Soviet Constitution directly violated the Declaration of Human Rights from the United Nations, and this issue became a prominent point of separation between the United States and the Soviet Union.
The Carter administration had been supporting human rights groups inside the Soviet Union, and Leonid Brezhnev accused the administration of interference in other countries' internal affairs. This prompted intense discussion of whether or not other nations may interfere if basic human rights are being violated, such as freedom of speech and religion. The basic disagreement[according to whom?] in the philosophies of a democracy and a single-party was in a state that did not allow for reconciliation of this issue. Furthermore, the Soviets proceeded to defend their internal policies on human rights by attacking American support of countries like South Africa and Chile, which were known to violate many of the same human rights issues.
In July of the same year, the Apollo-Soyuz Test Project became the first international space mission, wherein three American astronauts and two Soviet cosmonauts docked their spacecraft and conducted joint experiments. This mission had been preceded by five years of political negotiation and technical co-operation, including exchanges of U.S. and Soviet engineers between the two countries' space centers.
Trade relations between the two blocs increased substantially during the era of détente. Most significant were the vast shipments of grain that were sent from the West to the Soviet Union each year, which helped make up for the failure of kolkhoz, Soviet collectivized agriculture.
At the same time, the Jackson–Vanik amendment, signed into law by Gerald Ford on January 3, 1975, after a unanimous vote by both houses of the United States Congress, was designed to leverage trade relations between the U.S. and the USSR, making the United States' involvement dependent upon improvements of human rights within the Soviet Union, in particular allowing refuseniks to emigrate; it added to the Most Favoured Nation status a clause that provided that no countries resisting emigration could be awarded this status. This provided Jackson with a method of linking geopolitics to human rights.
The end of the Vietnam War
Nixon and his national security adviser, Henry Kissinger moved toward détente with the Soviet Union in the beginning of the 1970s. They had hopes that the Soviets would, in return, help the United States extricate or remove itself from Vietnam. People then started to notice the consciousness in which the American politics started to act with. 
SALT-Strategic Arms Limitations Talks
Nixon and Brezhnev signed an AMB treaty In Moscow on 26 May 1972 as well as an Interim Agreement (SALT 1) temporarily capping the number of strategic arms. This was a show of détente militarily, the diffusion of multiplication of Nuclear Ballistic Arms started to occur. 
Apollo-Soyuz-Hand Shake in Space
A significant example of an event which contributed to the détente was the handshake that took place in space. In July 1975, the first USSR-USA joint space flight was conducted and it was called the Apollo-Soyuz test project. The primary goal of this project was to create an international docking system in order to allow two different space crafts to join in orbit, this would have allowed the crews on board to collaborate on the exploration of space. This project marked the end of the Space Race that started in 1957 with the launch of Sputnik, therefore allowing the tensions between the US and the USSR to decrease significantly. 
During the 1960s, the American government was dealing with other internal conflicts, which forced the USA to relax their attention on the USSR and the Cold War issues.
Episodes throughout the 1960s caused this discontent in the American society to increase. The Americans claimed that the Court didn't impose laws against events such as extreme social and racial inequality and that this led to poverty. The Vietnam War gradually agitated and divided the American people. This was also clearly shown in the numerous confrontations between the youth and their parents’ generation due to a difference in the values and mentality they had been taught by the society in which they had grown up in.
The American anti-war activists reached their peak of discontent in 1968. This particular year was one of the bloodiest in that time period. This was caused especially by the launch of Tet offensive, an all-out attack against South Vietnam making the number of deaths become greater and therefore increase the American discontent. These protests reached their apex in August while the Democratic National Convention in Chicago was ongoing. The protesters were demanding that the government’s priority should be to get America out of the Vietnam war. The mayor of Chicago’s response to these protests was to get the police involved, thus not listening or giving the Americans what they requested. 
As direct relations thawed, increased tensions continued between the superpowers through their surrogates, especially in the Third World. Conflicts in South Asia, and the Middle East in 1973, saw the Soviet and U.S. backing their respective surrogates with war material and diplomatic posturing. In Latin America, the United States continued to block any leftward electoral shifts in the region by supporting right-wing military coups; during this period, there were also many communist or leftward guerrillas around the region, which were allegedly backed by the Soviets and Cuba. During much of the early détente period, the Vietnam War continued to rage. Neither side trusted the other fully and the potential for nuclear war remained constant.
Each side continued to aim thousands of nuclear warheads atop intercontinental ballistic missiles (ICBMs) at each other's cities, maintain submarines with long-range nuclear weapon capability (Submarine-launched ballistic missiles or SLBMs) in the world's oceans, keep hundreds of nuclear-armed aircraft on constant alert, and guard contentious borders in Korea and Europe with large ground forces. Espionage efforts remained a high priority as defectors, reconnaissance satellites, and signal intercepts measured intentions and attempted to gain strategic advantage.
The Soviet invasion of Afghanistan that was to shore up a struggling allied regime led to harsh criticisms in the west and a boycott of the 1980 Summer Olympics, which were to be held in Moscow. Jimmy Carter boosted the U.S. defense budget and began financially aiding the President of Pakistan, General Muhammad Zia-ul-Haq, who would in turn subsidize the anti-Soviet Mujahideen fighters in the region.
A contributing factor in the decline of Detente as a desirable American policy was the inter-service rivalry which existed between the American Departments of State and Defense. From 1973 to 1977 there were three Secretaries worth mentioning; Elliot Richardson, James Schlesinger, and Donald Rumsfeld. Schlesinger's time as Defense Secretary was plagued by notably poor relations with Henry Kissinger, one of the more prominent American advocates of Detente. Their poor working relationship bled into their professional relationship, and as a result an increasing number of policy clashes began to accrue. These clashes would inevitably result in Schlesinger's dismissal in 1975. However, his replacement, Donald Rumsfeld, shared Shlesinger's distaste for Kissinger.
As a result, the clashes on policy between the State Department and the Defense Department continued. Rumsfeld thought that Kissinger was too complacent about growing Soviet strength. While Rumsfeld largely agreed with Kissinger's assessment that the United States possessed superior military strength when compared with the Soviet Union, he argued that Kissinger’s public optimism would prevent Congress from giving the Department of Defense the funds which Rumsfeld believed were required to maintain the favorable gap between the US and the Soviets. In response, Rumsfeld regularly presented a more alarmist view of the Soviet threat, which he credited with convincing Congress to increase military spending.
In response to the stranglehold of influence which Kissinger possessed in the Nixon and Ford Administrations and the subsequent decline in influence over foreign policy by the Department of Defense, Richardson, Schlesinger, and Rumsfeld utilized growing popular antipathy for the Soviet Union in the United States to undermine Kissinger's attempts to achieve a comprehensive arms reduction treaty and thereby portray the entire notion of Detente as an untenable policy. 
The 1980 American presidential election saw Ronald Reagan elected on a platform opposed to the concessions of détente. Negotiations on SALT II were abandoned. However, during the later years of Reagan's presidency, he and Gorbachev pursued a policy that is considered Détente. Despite this, the Reagan administration talked about a "winnable" nuclear war, leading to the creation of the Strategic Defense Initiative and the Third World policy, funding irregular and paramilitary squads in Central America, sub-Saharan Africa, Cambodia, and Afghanistan.
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- Russian reset
- Cuban thaw
- 2018 North Korea–United States summit
- 2018 Russia–United States summit
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