According to Bei: I Started an Uprising in the Late Yuan Dynasty

The division and reunification of China in all dynasties was the victory of the north over the south, with the exception of the Ming Dynasty. In fact, Zhu Yuanzhang's victory in the world was largely due to chance. There are many people in the north and the land is vast. Even if natural disasters occur repeatedly, if managed properly, the country will be able to settle down after a few years of cultivation and rest, and its vitality will be restored to its original state in ten years. By then, it will be a crushing force on the south. If today's people traveled to the end of the Yuan Dynasty, captured Luoyang, Dingguan and then captured Long and Shu, it would not necessarily be clear to those who killed the Yuan Dynasty and conquered the world!