What Exactly is 'Taiwanese'? Q&A from Bubble Tea to the Republic of China

Republic of Taiwan? Stop joking. Where is this 'Republic of Taiwan' coming from? It doesn't even have a proper constitution, and you call it a country? Taiwan Province is just a part of the territory of the Republic of China, and together with the Penghu Archipelago and Kinmen and Matsu of Fujian Province, it is collectively called Taiwan, Penghu, Kinmen, and Matsu.