elected for the Fourth National Assembly. During fourth term, the U.S. withdrew its troops from Vietnam in accordance with Paris Peace Accords 1973. The Fifth National Assembly (1975–1976) The Fifth National Assembly consisted of 424 elected deputies. The fifth term was the shortest National Assembly's term as it was shortened to organize the nationwide general election after the re-unification of Vietnam. South Vietnam When the Republic of Vietnam existed, it had the National Assembly as its sole legislature. After the new constitution was passed in 1967, it had two parliamentary chambers: the Senate (Thượng-nghị-viện, literally Upper Parliament) and the House of Representatives (Hạ-nghị-viện, literally Lower Parliament), largely modeled after the United States Congress. After the Fall of Saigon, the Republic of South Vietnam also held the People's Assembly (Đại hội đại biểu Nhân dân) as its sole legislature. Since 1976 The Sixth National Assembly (1976–1981) This was the first election following the reunification of the North and South and the voters selected 492 members, of which 243 represented the South and 249 the North. In this term, the National Assembly adopted the name "the Socialist Republic of Vietnam" (Cộng hoà xã hội chủ nghĩa Việt Nam) for the re-unified country, merged corresponding organizations between the Government of North Vietnam and South Vietnam, and renamed Saigon as Ho Chi Minh City. It also approved the new Constitution in 1980. The Seventh National Assembly (1981–1987) The Seventh National Assembly and its 496 members witnessed the end of the Vietnamese centralized and heavily-planned economy and the CPV's launch of the Renewal Policy () to adopt market economy. Trường Chinh was elected as Chairman of the State Council and Nguyễn Hữu Thọ was elected as Chairman of the National Assembly. The Eighth National Assembly (1987–1992) In previous elections, because successful candidates were chosen in advance, the electoral process was not genuine. No one could run for office unless approved by the Communist Party, and in many cases the local body of the party simply appointed the candidates. Nevertheless, every citizen had a duty to vote, and, although the balloting was secret, the electorate, through electoral study sessions, received directives from the party concerning who should be elected. The elections in 1987, however, were comparatively open by Vietnamese standards. It was evident that the party was tolerating a wider choice in candidates and more debate. The 1987 election chose 496 deputies for the Eighth National