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In page Dutch Formosa:

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The native Formosan peoples had been in Taiwan for thousands of years before the Dutch arrived. Estimates of the total numbers of aborigines in Taiwan are difficult to come by, but one commentator suggests that there were 150,000 over the entire island during the Dutch era. They lived in villages with populations ranging from a couple of hundred up to around 2,000 people for the biggest towns, with different groups speaking different Formosan languages which were not mutually intelligible.