The settlement of the Americas began when Paleolithic hunter-gatherers entered North America from the North Asian Mammoth steppe via the Beringia land bridge, which had formed between northeastern Siberia and western Alaska due to the lowering of sea level during the Last Glacial Maximum
Migrants eventually induce social, economic, and political problems in receiving countries, including 1) increases in the population, with adverse effects on existing social institutions; 2) increases in demand for goods and services; 3) displacement of nationals from occupations in the countryside and in the cities;
Migration is the movement of people from one place to another with the intent to settle.
The Great Migration arguably was a factor leading to the American civil rights movement. … Seeking better civil and economic opportunities, many blacks were not wholly able to escape racism by migrating to the North, where African Americans were segregated into ghettos and urban life introduced new obstacles.