The Additional Articles of the Constitution of the Republic of China delegates numerous rights to exercise the sovereignty of the state, including that of electing the President and Legislature, to citizens residing in the "free area of the Republic of China". This term was first used in the Constitution with the promulgation of the first set of amendments to the Constitution in 1991 and has been retained in the most recent revision passed in 2005. The need to use the term "free area" in the Constitution arose out of the discrepancy between the notion that the Republic of China was the sole legitimate government of China and the pressures of the popular sovereignty movement. In the 1980s and 1990s, there were demands, particularly by the Tangwai movement and other groups opposed to one-party authoritarian KMT rule, to restructure the ROC government, long dominated by mainlanders, to be more representative of the Taiwanese people it governed. For example, until 1991, members of the National Assembly and Legislative Yuan elected in 1948 to serve mainland constituencies remained in their posts indefinitely and the President of the Republic of China was to be elected by this same "ten thousand year parliament" () dominated by aging KMT members. However, more conservative politicians, while acquiescing to the need for increased democracy, feared that constitutional changes granting localized sovereignty would jeopardize the ROC government's claims as the legitimate Chinese government and thereby promote Taiwan independence. While the 1991 revisions of the Constitution granted the sovereignty rights to the Taiwanese people, it did not explicitly name Taiwan and instead used the term "free area" to maintain the notion that the Republic of China encompassed more than Taiwan. In ordinary legislation, the term "Taiwan Area" is usually used, especially in contexts of trade and exchange. In contrast to the "free area" is the "mainland area", which the Act Governing Relations between the People of the Taiwan Area and the Mainland Area defines as "the territory of the Republic of China outside the Taiwan Area". However, on more practical grounds, the "mainland area" refers simply to mainland China. In addition, there are two other Acts defining other "areas": the "Hong Kong and Macau Area" (). The hand-over of these former European colonies to the People's Republic of China necessitated laws governing the relations of the Taiwan Area with them. The Acts are worded in a manner to avoid discussing whether the Republic of China claims sovereignty over Hong Kong and Macau.