How did the ancient population migration in China proceed? What's the point? Pray for the great gods.

1. Generally speaking, the most basic motivation of population migration lies in the imbalance of population and living materials in different regions. Population migration is one of the important levers to adjust the relationship between them. 2. The southward migration of the northern population (including a from the northern grassland to the Yellow River basin, and b from the Yellow River basin to the Yangtze River basin and the Pearl River basin) has a clear and powerful trajectory and lasts for a long time, which is the mainstream of ancient population migration in China. Its motive force comes from the nomadic people in the north going south to the Central Plains, which urges the population of the Yellow River basin to migrate to the Yangtze River basin and the Pearl River basin, thus making the population distribution in the three basins even, promoting the development of regional economy and pushing the ancient economic center of gravity south. There were three climaxes of northerners' southward migration: (1) The Three Kingdoms, the Jin Dynasty and the Southern and Northern Dynasties. (2) Five Dynasties and Ten Kingdoms (3) Southern Song Dynasty. 3. The migration of ancient mainland residents in China to the frontier often occurred during the period of unified dynasty; There are two ways to migrate: organized by the government and spontaneously carried out by ordinary people; Through immigration, the advanced culture and production technology of the mainland spread to the border areas, which promoted the cultural development and social progress in the border areas and consolidated the border defense. 4. The population of Qing Dynasty increased exponentially compared with that of Ming Dynasty, and the door of modern China was opened by the west, which provided conditions for the domestic surplus population to emigrate overseas (such as Southeast Asia and America). However, due to the missed opportunity of China's massive emigration, the poor in the Mainland had to move to remote areas (northwest, northwest, etc.). ) .5. The main factors that affect the normal development of China population are the war and all kinds of natural and man-made disasters that follow.