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Mainland Chinese came to dominate Taiwan and formed substantial minorities in many parts of Southeast Asia. What would it take for some parts of Asia outside of the Japanese islands to have a similar presence of overseas Japanese, to the extent that Japanese is an important language there, Japanese and their descendants having an important place in government, economy, and entertainment industry, Japanese culture (restaurants and cuisine, Shinto temples, etc) ubiquitous? Where could these be possible? Could we have a Japanese-settled Taiwan before the Chinese arrive? Parts of Malaysia, the Philippines?
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