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The mass migration of the population became one of the characteristic phenomena of the life of the world community the second half of the 20th century. Migration is the movement of people across borders of certain territories with change of residence or return to it.Overview of the migration process in the world is such that the second half of the past century was a time of unprecedented growth in population and the growth of cities and urban agglomerations. In developed countries, the majority of the population currently resides in metropolitan areas, that is, in clusters of closely related settlements. The main criterion of occurrence and unmistakable in the agglomeration is a total balance, that is, a situation where a large part of the population works in other cities alone. The migration of people around the world were, in general terms, in the same way: from village to city, from small cities to large and mostly within State borders.
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