If Taiwan. 🇹🇼. Is not. A part of. MAINLAND CHINA 🇨🇳. WHY DO TAIWANESE. SPEAK mandarin like. Mainland. China
Taiwan is an exiled government that previously controlled a majority of China. Communist China kind of overthrew them though through civil war. The island is still culturally Chinese.
They speak their own dialect of Mandarin along with Chinese mandarin & standard mandarin.