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What would happen if Zhu Yuanzhang retreated to Luzon Island in the Southern Song Dynasty?

Luzon Island is located in the northern part of the Philippine Islands. It is the largest, most populous and most developed island in the Philippines. Luzon Island is rich in rice and coconut, and Luzon cigars are world-famous. Luzon Island is also one of the three administrative regions of the Philippines (Luzon Island, Visayas Island and Mindanao Island). China ancient books called Luzon Island "Little Luzon".