The political status of Taiwan is a longstanding geopolitical subject focusing on the sovereignty of the island of Taiwan and its associated islands. The issue has been in dispute since the alleged retrocession of Taiwan from the Empire of Japan to the Republic of China (ROC) in 1945, and the ROC government’s retreat from mainland China to Taiwan as the result of the Chinese Civil War in 1949. The Taiwan Area since then has become the major territorial base of the ROC. The Chinese Communist Party (CCP)-led People’s Republic of China (PRC), despite never having control of it, claims Taiwan as an inalienable province. The PRC's claim is based on the theory of state succession, who deems itself as the regime that replaced the pre-1949 ROC, and denies the existing sovereignty of the ROC in Taiwan under its one China principle.
The ROC governed mainland China from 1912 until 1949, when it lost control of the mainland due to its defeat in the Chinese Civil War by the CCP, who established the PRC that same year, while the effective jurisdiction of the ROC has been limited to Taiwan and its associated islands. Prior to this, Japan’s surrender in 1945 ended its colonial rule over Taiwan and the Penghu Islands, which were subsequently placed under the administration of the ROC as agreed by the major Allies of World War II. However, post-war agreements did not clearly define sovereignty over these islands due to the ongoing rivalry between the Kuomintang (KMT) and the CCP. The division led to the emergence of two rival governments on opposite sides of the Taiwan Strait, each claiming to be the sole legitimate authority over both the Chinese mainland and Taiwan. The PRC and historically the ROC both officially adhere to the principle of "one China," but fundamentally disagree on who is entitled to represent it. This has resulted in what is known as the "Two Chinas" scenario, reflecting the unresolved dispute over which government is the legitimate representative of China.