/kloc-what was the flow direction of international population migration before the 0/9th century?

Europe flows to the United States, and African blacks are sold to the United States. From the analysis of the motivation of international population migration, it can be summarized as political and economic aspects. Political migration is mainly due to domestic unrest.

This kind of unrest can be caused by wars, changes, disputes between sects and social groups, so this kind of migration is often called forced migration. Economic migration is often caused by poverty. Generally, it is up to the individual to decide whether to migrate, and the main purpose of migration is to improve the economic status. ?

The migration activities of expanding data population by crossing national boundaries and changing residence within a certain period of time (usually 1 year). International migration has occurred continuously in history, and the biggest one is the climax of migration from the old continent to the new continent since the geographical discovery of15th century. The main directions of modern international immigration are: Europe continues to immigrate to the New World; African slaves were forced to be sold to the United States;

China, Japanese and Indians began to migrate to Southeast Asia, America and Oceania. After the Second World War, the characteristics of international immigration have changed: the immigration to the new world that lasted for hundreds of years is coming to an end; More and more foreign workers flow from developing countries to developed countries; Due to the frequent outbreak of regional political conflicts, international refugees are constantly emerging.

Baidu Encyclopedia-International Population Migration