1) In 1894, Japan invaded China and Korea, the Qing govt was defeated and signed the [Treaty of Shimonoseki] to cede Taiwan Island to Japan. 2) During the WW2, at the Cairo Conference held in 1943, China asked the transfer of Taiwan's sovereignty back to China after the war. This content was included in the [Cairo Declaration] and later reiterated in the [Potsdam Proclamation] that it should be implemented. 3) In 14 Aug & 2 Sept 1945, the Emperor and govt of Japan issued the [End War Edict] and [Japanese Instrument of Surrender], Japan surrendered and accepted the [Potsdam Proclamation]. Japanese troops in Taiwan surrendered to KMT General CKS and Taiwan re-entered the territory of the Republic of China (ROC). 4) Soon after that China civil war broke out in between KMT and CCP, the KMT was defeated and fled to Taiwan. However, due to US intervention, the CCP without strong navy at that time has no ability to unify Taiwan. The CCP then established the People's Republic of China (PRC) in 1949. The civil war continues. 5) In 1971, UN Resolution No. 2758 ruled that the PRC had obtained the representation rights and all legal rights originally owned by the ROC in the UN. That means the PRC is China’s only legal govt under international law and is recognized by 181 countries around the world, including the USA. "The USA recognizes the Government of the PRC as the sole legal Government of China." "The USA acknowledges the Chinese position that there is but one China and Taiwan is part of China." Joint Cummunique on the Establishment of Diplomatic relations between the PRC and the USA in 1979. Please refer to President Jimmy Carter's Speech on Relations with China. 6) Therefore, according to international law, international reality, and the wishes of the 1.4 billion Chinese people, Taiwan should return to PRC and the PRC have every rights to protect it's sovereign integrity.