黨外運動
The Kuomintang (KMT) held a supermajority of seats in the Legislative Yuan between 1948 and 1991, while some seats were held by the Chinese Youth Party (CYP) and the China Democratic Socialist Party (CDSP). Through the limited supplementary elections held in since the 1970s, the Tangwai movement saw their share of seats increase. Most members in the Tangwai movement joined the Democratic Progressive Party (DPP) after its founding in the late 1980s.