irregularities after fierce debate. In 1954, Rhee again forced an amendment, removing term limits for himself and emphasizing a capitalistic economic model. Rhee was overthrown in 1960 following widespread protests against his increasingly authoritarian rule. Partly in response to Rhee's abuses, the Second Republic turned to a parliamentary system. The 1960 Constitution provided for a figurehead president, a bicameral legislature, a cabinet headed by a prime minister, an election commission, and a constitutional court. It also provided for elections for supreme court justices and provincial governors, as well as natural law-based individual rights. With the May 16 coup of Park Chung-hee in 1961, the 1960 version was nullified, and in 1962, the Third Republic's Constitution was passed. The document returned to a presidential system. It had a number of similarities to the United States Constitution, such as presidential elections held by the National Assembly in the event of a tie and carrying out judicial review by the ordinary Supreme Court instead of a specialized Constitutional Court, though in practice military government would continue in some form until democratization. In 1972, Park extended his rule with the Fourth Republic's constitution, called the Yushin Constitution, which gave the president sweeping (almost dictatorial) powers and permitted him to run for an unlimited number of six-year terms. After Park was assassinated in 1979, the Fifth Republic began with the 1980 Constitution under President Chun Doo-hwan. The president's powers were curbed somewhat. He was limited to a single seven-year term, with no possibility of reelection. As with the Yushin Constitution, it provided for a presidential electoral college and a semi-presidential system of government. Critically, however, the President retained the right to suspend civil liberties and rule by decree. With the pro-democratic protests of 1987 (June Democracy Movement), the 1988 Constitution of the Sixth Republic was passed. The constitutional bill was passed by the National Assembly on October 12, 1987, and approved by 93 percent in a national referendum on October 28, taking effect on February 25, 1988, when Roh Tae-Woo was inaugurated as president. The president's powers were curtailed and the constitutional court was restored. Amendment of the Constitution of South Korea Succession of spirit The spirit of April Nineteenth and March 1st Movement is stipulated in the preamble of the Constitution of South Korea. However, it took a long time to be established. The contents of the April Revolution were removed on the fifth