On September 8, 1951, the main body of the international community held the San Francisco Peace Conference at the San Francisco War Memorial Opera House, which officially ended the WWII in the Pacific Theater. International affairs also had a new turning point. In the peace treaty, Japan formally renounced all right, title and claim to Formosa and the Pescadores; it also renounced all special rights and interests in China, retroacted back to the final Protocol signed at Peking on 7 September 1901. The full sovereignty of Taiwan and Penghu were ceded in perpetuity to Japan through the Shimonoseki Treaty signed on April 17, 1895. There has been not any legal document or international treaty change. The United States was officially authorized by the SFPT as the principal occupying power of Taiwan.
USA: Taiwan has never been a part of China.
CHN: Taiwan is an inalienable part of China.
KMT: Taiwan belongs to China.
DPP: Taiwan is ROC, and ROC is Taiwan named as ROC-Taiwan.
However, Bay Area Taiwanese said: Taiwan is Taiwan, it does not belong to any China, ROC or PRC.
September 8th this year coincides with the 70th anniversary of the signing of the San Francisco Peace Treaty. You are welcome to come to San Francisco’s War Memorial Opera Square when you are free to explore the de jure Taiwan Sovereignty.