Introduction of Ancient Immigrants in China

In the history of the Chinese nation, the middle and lower reaches of the old course of the Yellow River are the birthplace of ancient civilization and the center of ancient population distribution in China. Until the Qin and Han dynasties, the population of this area accounted for about 80% of the total population of the country. Decades of social unrest at the end of the Western Han Dynasty led to "cannibalism, empty city walls and wild bones", and the population loss in the Yellow River basin was serious. During the 90 years from the end of the Eastern Han Dynasty to the end of the Three Kingdoms, there were frequent wars in the Central Plains, and people in this area fled to the relatively stable south, making "the hukou in the Central Plains not one tenth". The northern and western minorities, such as Xiongnu, Xianbei, Xiongnu, Biandi and Qiang, moved inward one after another, and by the early years of the Western Jin Dynasty, the number had reached several million. They have lived together with the Han nationality for a long time, influenced each other, and the national boundaries are narrowing day by day.