Tangwai movement
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.