The influence of three large-scale population movements on cultural changes in China's history.

During the Jin Dynasty, Shandong and Shanxi became the main battlefields, which led to the migration of a large number of people from the Central Plains to the south, which was the first climax in history. The second southward migration took place between the Song Dynasty and the Anshi Rebellion. The Jin Dynasty destroyed the Northern Song Dynasty, and the change of Jingkang caused the third climax of southward migration. Economic impact: The third migration to the south brought a large number of laborers into the south, as well as more advanced production technologies and tools, and the agricultural production level in the south was improved in quantity and quality. After the southward migration, the agricultural center of ancient China moved southward to the middle and lower reaches of the Yangtze River. Cultural influence: the northerners who moved south brought many new customs and habits to the south, and rented out the integration of north and south cultures. For example, Lin 'an was built in the Southern Song Dynasty, and even the locals in the south often followed the old customs of Bianjing and hung kitchen lamps in front of the door. Teahouses learn to hang portraits of celebrities in the north. More interestingly, people in the north eat cage cakes and steamed cakes by peeling them first, because there is much dust in the north, but Renye Fang follows suit, peeling them before eating. The southward movement of the economic center also brings the southward movement of the cultural center. Since the Southern Song Dynasty, Jiangsu and Zhejiang have become talent-intensive areas, and there is a saying that "the land is rich, and people trace it back to the source".