Historical composition on the speed of ancient immigrants ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Historical composition on the speed of ancient immigrants ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ Immigration is generally divided into several factors: ① war, ② geography (including environment and climate) and ③ humanities.

Population migration is always accompanied by the process of human development. Economy is the main factor affecting population migration, in addition, political, military and religious factors are also important factors affecting population migration. Since the founding of the People's Republic of China, China's population migration is mainly related to economic development. Generally speaking, the population migration in China can be divided into three categories: the population migration in coastal areas, especially the population migration from coastal cities to the western region in the 1950s and 1960s, such as enterprise migration and border support; 2. Urbanization movement characterized by rural labor mobility since the reform and opening up; 3. And engineering immigrants formed by engineering construction projects.

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.

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.

You can also refer to /view/85230.htm or Zhang's New Theory of Immigrant Culture.