
Human migration is a major social phenomenon, which shows in the most effective way the changes occurring in the contemporary world. The difference in the level of development in different regions, the increase in international economic interdependence, progress in the field of mass media and transport, respect for the right of immigrants to family reunification, the increase in armed conflicts that lead to the appearance of an ever-increasing number of refugees and displaced people, are among the factors that generate population mobility. The phenomenon of international migration has always existed through transhumance, invasions, colonizations and crusades. There is no example in the history of any country that did not benefit from a dynamic demography that reflected to some extent on the economic or political situation of the country or that was constituted by an absolutely homogeneous population.
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