/kloc-on the great migration of European immigrants in the late 0/9th century

After industrial revolution in europe, a large number of farmers lost their land and went bankrupt, and moved to cities as workers.

With the development of the second industrial revolution, more and more workers began to lose their jobs.

At the same time, emerging capitalist countries need a large number of labor and population to enrich their national strength.

This one more and one less, one out and one in, caused the flow of European immigrants from developed countries to underdeveloped countries.