Mikhail Sergeyevich Gorbachev (born 2 March 1931) is a Russian and former Soviet politician. The eighth and final leader of the Soviet Union, he was the General Secretary of the Communist Party of the Soviet Union from 1985 until 1991. He was also the country's head of state from 1988 until 1991, serving as the chairman of the Presidium of the Supreme Soviet from 1988 to 1989, chairman of the Supreme Soviet from 1989 to 1990, and president of the Soviet Union from 1990 to 1991. Ideologically, Gorbachev initially adhered to MarxismLeninism although he had moved towards social democracy by the early 1990s.

Gorbachev was born in Privolnoye, Stavropol Krai, to a poor peasant family of Russian and Ukrainian heritage. Growing up under the rule of Joseph Stalin, in his youth he operated combine harvesters on a collective farm before joining the Communist Party, which then governed the Soviet Union as a one-party state according to the prevailing interpretation of MarxistLeninist doctrine. While studying at Moscow State University, he married fellow student Raisa Titarenko in 1953 prior to receiving his law degree in 1955. Moving to Stavropol, he worked for the Komsomol youth organization and, after Stalin's death, became a keen proponent of the de-Stalinization reforms of Soviet leader Nikita Khrushchev. He was appointed the First Party Secretary of the Stavropol Regional Committee in 1970, in which position he oversaw construction of the Great Stavropol Canal. In 1978, he returned to Moscow to become a Secretary of the party's Central Committee, and in 1979 joined its governing Politburo. Within three years of the death of Soviet leader Leonid Brezhnev, following the brief regimes of Yuri Andropov and Konstantin Chernenko, the Politburo elected Gorbachev as General Secretary, the de facto head of government, in 1985.

Although committed to preserving the Soviet state and to its socialist ideals, Gorbachev believed significant reform was necessary, particularly after the 1986 Chernobyl disaster. He withdrew from the SovietAfghan War and embarked on summits with United States president Ronald Reagan to limit nuclear weapons and end the Cold War. Domestically, his policy of glasnost ("openness") allowed for enhanced freedom of speech and press, while his perestroika ("restructuring") sought to decentralize economic decision-making to improve efficiency. His democratization measures and formation of the elected Congress of People's Deputies undermined the one-party state. Gorbachev declined to intervene militarily when various Eastern Bloc countries abandoned MarxistLeninist governance in 19891990. Internally, growing nationalist sentiment threatened to break up the Soviet Union, leading MarxistLeninist hardliners to launch the unsuccessful August Coup against Gorbachev in 1991. In the wake of this, the Soviet Union dissolved against Gorbachev's wishes and he resigned. After leaving office, he launched his Gorbachev Foundation, became a vocal critic of Russian presidents Boris Yeltsin and Vladimir Putin, and campaigned for Russia's social-democratic movement.

Widely considered one of the most significant figures of the second half of the 20th century, Gorbachev remains the subject of controversy. The recipient of a wide range of awards, including the Nobel Peace Prize, he was widely praised for his pivotal role in ending the Cold War, introducing new political freedoms in the Soviet Union, and tolerating both the fall of MarxistLeninist administrations in eastern and central Europe and the reunification of Germany. Conversely, he is often derided in Russia for accelerating the Soviet dissolution, an event which brought a decline in Russia's global influence and precipitated an economic collapse.

George Herbert Walker Bush (June 12, 1924 – November 30, 2018) was an American politician, diplomat, and businessman who served as the 41st President of the United States from 1989 to 1993. A member of the Republican Party, Bush also served as the 43rd vice president from 1981 to 1989 under Ronald Reagan, in the U.S. House of Representatives, as U.S. Ambassador to the United Nations, and as Director of Central Intelligence.

Bush was raised in Greenwich, Connecticut, and attended Phillips Academy before serving in the United States Navy Reserve during World War II. After the war, he graduated from Yale and moved to West Texas, where he established a successful oil company. After an unsuccessful run for the United States Senate, he won the election to the 7th congressional district of Texas in 1966. President Richard Nixon appointed Bush to the position of Ambassador to the United Nations in 1971 and to the position of chairman of the Republican National Committee in 1973. In 1974, President Gerald Ford appointed him as the Chief of the Liaison Office to the People's Republic of China, and in 1976 Bush became the Director of Central Intelligence. Bush ran for president in 1980, but was defeated in the Republican presidential primaries by Ronald Reagan, who then selected Bush as his vice presidential running mate.

In the 1988 presidential election, Bush defeated Democrat Michael Dukakis, becoming the first incumbent vice president to be elected president since Martin Van Buren in 1836. Foreign policy drove the Bush presidency, as he navigated the final years of the Cold War and played a key role in the reunification of Germany. Bush presided over the invasion of Panama and the Gulf War, ending the Iraqi occupation of Kuwait in the latter conflict. Though the agreement was not ratified until after he left office, Bush negotiated and signed the North American Free Trade Agreement (NAFTA), which created a trade bloc consisting of the United States, Canada, and Mexico. Domestically, Bush reneged on a 1988 campaign promise by enacting legislation to raise taxes with the justification of reducing the budget deficit. He also championed and signed three pieces of bipartisan legislation, the Americans with Disabilities Act of 1990, Immigration Act of 1990 and the Clean Air Act Amendments of 1990. He also successfully appointed David Souter and Clarence Thomas to the Supreme Court. Bush lost the 1992 presidential election to Democrat Bill Clinton following an economic recession, his turnaround on his tax promise, and the decreased emphasis of foreign policy in a post–Cold War political climate.After leaving office in 1993, Bush was active in humanitarian activities, often working alongside Bill Clinton, his former opponent. With the victory of his son, George W. Bush, in the 2000 presidential election, the two became the second father–son pair to serve as the nation's president, following John Adams and John Quincy Adams. Another son, Jeb Bush, unsuccessfully sought the Republican presidential nomination in the 2016 Republican primaries. Historians generally rank Bush as an above-average president.