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The following is a treatment of South Korea since the Korean War. For a discussion of the earlier history of the peninsula, see Korea.
South Korea to 1961
The First Republic
The First Republic, established in August 1948, adopted a presidential system, and Syngman Rhee was subsequently elected its first president. South Korea also adopted a National Security Law, which effectively prohibited groups that opposed the state or expressions of support for North Korea. Rhee was reelected in August 1952 while the country was at war. Even before the outbreak of the Korean War (1950–53), there had been a serious conflict between Rhee and the opposition-dominated National Assembly that had elected him in 1948. The dispute involved a constitutional amendment bill that the opposition introduced in an attempt to oust Rhee by replacing the presidential system with a parliamentary cabinet system. The bill was defeated, but the dispute continued at Busan, the wartime provisional capital, where the National Assembly was reconvened.
When the opposition introduced another amendment bill in favor of a parliamentary cabinet system, Rhee in 1952 countered by pushing through a bill that provided for the popular election of the president. Later, in 1954, Rhee succeeded in forcing the National Assembly, then dominated by the ruling party, to pass an amendment that exempted him from what was then a two-term limit on the presidency. Under the revised constitution, Rhee ran successfully for his third term of office in May 1956. His election for the fourth time, in March 1960, was preceded by a period of tension and violence and was followed by accusations that the election had been fraudulent. Massive student demonstrations took place that culminated in a major event on April 19 in which many demonstrators died. Rhee resigned under pressure six days later and fled to exile in Hawaii, where he died in 1965 at age 90.
The Second Republic
The Second Republic, which adopted a parliamentary cabinet system, lasted only nine months. A figurehead president was elected by both houses of the legislature, and power was shifted to the office of Prime Minister Chang Myon (Jang Myeon), who was elected by the lower house by a narrow margin of 10 votes.
The Chang government made some strenuous efforts to initiate reforms. In a society laden with social and economic ills accumulated over a long period of time, however, it failed to cope with the unstable situation created by a violent political change. Rampant political factionalism only made the situation worse. With the ultimate source of authority now vested in the office of the prime minister, all factions, conservative and moderate, engaged in constant maneuvering to win over a group of independents in order to form a majority in the legislature. Before Chang had time to launch a full program of economic reform, the leadership of the ruling Democratic Party was crippled by factional strife within its ranks.
Military rule
The 1961 coup
On May 16, 1961, the military seized power through a carefully engineered coup d’état, ushering in a new phase of postliberation Korean politics. The military junta, led by Gen. Park Chung-Hee, took over the government machinery, dissolved the National Assembly, and imposed a strict ban on political activity. The country was placed under martial law, and the Supreme Council for National Reconstruction (SCNR), headed by Park, took the reins of government and began instituting a series of reforms.
In November 1962 the SCNR made public a constitutional amendment bill that provided for a strong president and a weak, single-chamber National Assembly. The bill was approved by a national referendum one month later. A series of events unfolded in the first half of 1963. In February Park announced that he would not take part in the civilian government to be formed later in the year if civilian political leaders chose to uphold a nine-point “political stabilization proposal.” However, as a result of bitter turbulence within the ruling junta and a chaotic situation created by the proliferation of minor political parties, Park soon changed his mind and proposed that military rule be extended for four years. The proposal met vigorous opposition from civilian political leaders, but some 160 military commanders, most of them generals, supported the extension. In April, Park, under considerable domestic and international pressure (particularly from the United States), announced a plan for holding elections toward the end of the year. Park was named presidential candidate of the newly formed Democratic Republican Party (DRP) in late May.
The Third Republic
The election for president of the Third Republic took place on October 15, 1963. Park narrowly defeated the opposition candidate, Yun Po-Sun (Yun Bo-Seon), former president (1960–62) of the Second Republic, who had remained in office as a figurehead at the request of the junta to provide constitutional continuity for the military government. When political activity was permitted to resume, Yun led the mustering opposition groups and became the presidential candidate of the Civil Rule Party. In May 1967 Park was elected to his second term of office, and the DRP won a large majority in the National Assembly. Members of the opposition New Democratic Party (NDP), whose head was the twice-defeated Yun, claimed fraud and refused for some time to take their seats in the National Assembly.
During his second term, President Park faced the constitutional provision that limited the president to two consecutive four-year terms. Amid extensive political turmoil created by the demonstrations of opposition politicians and students, the DRP members of the legislature passed a constitutional amendment that would make a president eligible for three consecutive four-year terms. The amendment was approved by a national referendum in October 1969. In the presidential elections held in April 1971, Park defeated Kim Dae-Jung of the NDP; however, the NDP made substantial gains, especially in major urban areas, securing 89 seats in the National Assembly election as against 113 seats won by the ruling DRP.