Where does the accent of Putonghua in Taiwan Province Province come from?

The accent in Taiwan Province Province is basically Minnan accent, because most people immigrated from Fujian at first.

However, the accent of Taiwan Province Province has changed greatly because of Hakka, an aboriginal language, and Mandarin that many families secretly learned during Japanese rule.

The northern and southern dialects in Taiwan Province Province are also different. The southern cavity is flat and the northern cavity is round.