In the much-improved political climate of the Sixth Republic, South Korea hosted the highly successful Summer Olympic Games in Seoul later that year. Roh proceeded to bring about a merger (1990) of the DJP with the Reunification Democratic Party of Kim Young-Sam and the New Democratic Republican Party of Kim Jong-Pil, who for a time had been prime minister during the Fourth Republic. The resultant Democratic Liberal Party (DLP) commanded an overwhelming majority in the National Assembly.

While it was reestablishing democracy in the domestic political arena, the Roh government initiated the so-called “northern diplomacy” policy toward the Soviet Union and its allies. These efforts brought about the establishment of diplomatic ties with Hungary, Poland, and Yugoslavia in 1989 and with the Soviet Union in 1990. Relations between South Korea and China improved as well, and in 1992 the two countries established full diplomatic ties. That December Kim Young-Sam was elected president on the DLP ticket, and he succeeded Roh in February 1993.

Kim, the first civilian president in more than 30 years, sought to extricate the military from power and to reassert civilian supremacy over the military. Shortly after taking office, he purged thousands of bureaucrats, military leaders, and businessmen, released thousands of political prisoners, and launched a major anti-corruption initiative (notably banning bank accounts under false names). Kim’s popularity surged, but a severe economic downturn and the continued entrenchment of corruption (Kim’s own son was arrested on charges of bribery and tax evasion) diminished his standing by the end of his term. He also oversaw a historic reform of local government. Local elections, which had been suspended indefinitely in 1961, were reinstated in limited fashion in 1991 and fully restored in 1995, allowing voters to choose governors and mayors of major cities.

During Kim’s term his two predecessors, Chun Doo-Hwan and Roh Tae-Woo, were arrested. Roh had shocked the country by admitting that he had amassed a political slush fund of some $650 million, and both men were convicted of corruption for having plotted the 1979 coup that had brought Chun to power and for treason in the massacre of protestors at Gwangju in 1980; Chun was sentenced to death and Roh to 221/2 years’ imprisonment (commuted to life imprisonment and 17 years, respectively). In addition, nine executives of South Korea’s chaebol (business conglomerates) were convicted of bribing Chun and Roh in return for government favors.

In December 1997 perennial opposition candidate Kim Dae-Jung was elected president of South Korea, narrowly defeating the New Korea Party (NKP; the renamed DLP) nominee. Shortly after the election, Chun and Roh were pardoned in a gesture of goodwill, and on February 25, 1998, Kim was sworn in as president. Kim implemented a so-called “sunshine” policy toward the North, which led in 2000 to a historic summit between Kim and North Korean leader Kim Jong Il and to Kim Dae-Jung’s selection as the recipient of that year’s Nobel Prize for Peace. Nevertheless, his administration was also plagued by corruption scandals, and his international policies met resistance from the United States. Still, in 2002 South Korea basked in the success of the World Cup association football (soccer) finals, which it cohosted with Japan and at which its national team reached the semifinals, the first time an Asian team had advanced so far. That same year, the country also hosted the Asian Games in Busan.

In 2003 Kim was succeeded as president by Roh Moo-Hyun of Kim’s Millennium Democratic Party. A lawyer, Roh was a strong supporter of democratic reforms and had established himself as a defender of leftist demonstrators. Roh faced intense opposition from the more conservative Grand National Party (the former NKP), and in 2004 he was impeached by the National Assembly. Roh temporarily withdrew from office while the Constitutional Court considered the charges. In parliamentary elections that year, his party captured a majority in the National Assembly; Roh was subsequently acquitted, and he resumed office. In the 2007 presidential election, the Grand National candidate, former Seoul mayor Lee Myung-Bak, won in a landslide. Legislative elections the following year gave the Grand National Party a slim majority in the National Assembly. Under its new name, Saenuri (New Frontier) Party, the ruling party retained power in the 2012 presidential election. The winning candidate, Park Geun-Hye, was the daughter of Park Chung-Hee and was the first woman to be elected president of South Korea.

Park’s administration came under heavy criticism in April 2014 after the ferry Sewol sank en route from Incheon to Jeju Island, resulting in the deaths of all but 172 of the nearly 500 passengers on board, most of them high-school students. The ship had been made unstable by structural retrofitting and an excessive cargo load. Park’s administration came under fire for the prevailing laxity of safety regulations, which critics charged had come about because of too-close ties between regulatory bodies and industry. In addition, many deemed the rescue efforts and the Park administration’s response to the crisis to have been inefficient and inadequate. The incident sparked discussion of the consequences of the country’s rapid modernization.

During the 2012 campaign Park had offered an apology for the human-rights abuses that had occurred under her father’s rule, but civil rights groups were watchful during her administration. In December 2014 the constitutional court, after a petition by the government, banned the left-wing Unified Progressive Party, causing some wariness regarding political freedom in the country. The party forfeited its five seats in the National Assembly and was disbanded. In late 2015 controversy erupted over the government’s decision to create a single, state-issued history textbook for all public schools. The government asserted that the existing selection of textbooks had a leftist slant and pro-North Korean bias, and it moved to produce its own book.

In parliamentary elections in April 2016, Park’s conservative Saenuri Party lost its long-held majority. The president’s fortunes sank further when her longtime confidant, Choi Soon-Sil, was arrested on suspicion of using her connection with Park to peddle influence. Hundreds of thousands took to the streets in protest, and on December 9, 2016, Park was impeached by the National Assembly. Prime Minister Hwang Kyo-Ahn was named acting president pending ratification of the impeachment by the Constitutional Court. The head of the national pension fund was also implicated in the influence-peddling scandal, as was the acting head of Samsung. The court upheld the impeachment on March 10, 2017, and Park was officially removed from office.

Park’s dismissal paved the way for her potential prosecution, as she was no longer protected by presidential immunity, and a snap election was scheduled. Moon Jae-In of the Democratic United Party had been narrowly defeated by Park in the 2012 presidential contest, and he quickly emerged as the clear favorite to succeed her. While it initially appeared that no one could hope to challenge his front-runner status, the race took several surprising twists. An abortive bid by former United Nations secretary-general Ban Ki-Moon provided a momentary glimmer of hope for the conservatives, who were still in disarray in the wake of Park’s impeachment. Center-left candidate Ahn Cheol-Soo, who had been a member of Moon’s party until striking out on his own in 2015, rallied in the weeks prior to the election. When Korean voters went to the polls on May 9, 2017, however, they handed Moon a convincing victory. Moon promised greater engagement with the North and a new job-creation program for young adults, while pledging to work with other parties to govern effectively. The last point was a matter of necessity rather than choice, as the Democratic United Party was well short of a majority in the National Assembly, and legislative elections were not scheduled to be held until 2020.