Spain would be able to control part of the island without large scale warfare. They probably would not be able to control the whole island. Remember, no one had control of the interior of the island until the Japanese, and that took modern weapons and aircraft to achieve.So Spain could get the island without large scale warfare..well that's new.
With that answered how would Formosa develop under Spanish rule. Wasn't Taiwan barely settled during the time with the Chinese concentrated in the coastal regions whi the natives are inland. How culture, religion and the island as a whole develop.
Taiwan did not have a large population, but that doesn't mean it was barely settled.
Why would there be a large Chinese population? There were very few Chinese present on the island until the Dutch came, and unless the Spanish encouraged Chinese immigration, there wouldn't be many on Taiwan. In fact, there were probably just as many Japanese people as there were Chinese.Actually, Formosa would be one of the Philippine Islands, albeit one with a large Chinese population. If Spain managed to hang onto it, Formosa would pass to the United States with the Philippines in 1898 too.
If not Spanish then probably one of the more widespread aboriginal languages. Siraya would be a good bet, since they had the largest population and occupied the most area.By the way, what could be the lingua franca of Formosa if Spain controlled it?
Again, why would there be a lot of Chinese people? And why would they speak Mandarin? If any Chinese language were present, it would be one of the southern languages. Probably Hokkien like in OTL Taiwan. Taiwan was by no means crowded, but it did have a significant population before Chinese migration. To say that they wouldn't make up an important part of Spanish Formosa is ridiculous.Culturally there would be a lot of people of Chinese decent in this formosa. They would be predominantly christian. Would speak in either, mandarin, spanish, tagalog or kapampangan.
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