/kloc-reasons for population migration in the 0/6th century

The opening of new sea routes and the colonial expansion of European countries. The opening of the new air route has enabled European countries to immigrate to America and other regions. At the same time, European powers began to colonize Asia, Africa and Latin America, which made a large number of Europeans move to colonies. In addition, the beginning of the industrial revolution also made European and American countries need more labor, so a large number of European immigrants poured into the United States and other countries.