The most direct cause of population migration in the history of our country is

Causes of Population Migration in Ancient China

(1) The backward mode of production of ethnic minorities and the advanced economy and culture in the Central Plains attract ethnic minorities to move in.

(2) The constant war in the north and the relative stability in the south led to a large number of northerners moving south.

(3) The ruling class organized military and civilian migration for political, economic and military purposes.

(4) the autocratic rule of the ruling class, land annexation, etc. Farmers were displaced and the population was forced to move. 3. The significance of ancient population migration in China.

(1) promotes the great integration of the Chinese nation, is conducive to national unity, and promotes the development of a unified multi-ethnic country.

(two) is conducive to the economic and cultural exchanges between the people of all ethnic groups in China, and promote the economic progress and development of all ethnic groups.

(3) It is conducive to the development of the south of the Yangtze River and promotes the economic center of ancient China to move southward.

(4) Develop Nanyang and contribute to the development of world civilization.

(5) The population distribution is becoming more and more reasonable, and the population resources are being developed and utilized.