Why do people in Taiwan Province Province speak Minnan?

The formation of Minnan dialect is mainly due to three waves of immigrants, and the reason of immigration is to recruit barbarians and avoid chaos:

In Taiwan Province Province, almost all educational occasions are taught in Putonghua, and the preferred language of public media such as media is Putonghua, which makes it difficult to preserve the language of Minnan ethnic group, which accounts for nearly 80% of Taiwan's population. Generally speaking, young people in central and southern Fujian are more fluent in Minnan dialect than young people in northern Fujian, and their Minnan language ability is generally lower than that of the elderly, especially the new generation born after 1990. Due to the official status of Mandarin, some parents who are not very conscious of their mother tongue also choose Mandarin to communicate with their new generation of children. As for Cantonese culture, it is not popular in Taiwan Province Province, mainly because most of the popular versions of early Hong Kong films in Taiwan Province are dubbed in Putonghua, and the only one that can influence Taiwanese in Minnan is Putonghua, and in recent years, the phenomenon that Taiwanese and Chinese are mixed has become the mainstream.