NEED HELP NOW Will award Brainiest if correct: Explain historical and contemporary geographic effects of migration

A SHORT DEFINITION FOR MIGRATION STUDIES

The movement of groups and individuals from one place to another, involving a change of usual residence. Migration is usually distinguished from mobility in general by conventions of spatial and temporal scale. For example, by convention international migration requires crossing a national boundary for an actual or intended period of at least one year. Residential mobility, by contrast, may consist of a short-distance move between properties in the same city.

Typologies of migration differentiate between internal and international migration, and the two forms are usually studied separately. Looked at historically, however, the movement of people long predates nation-states; homo sapiens left Africa some 150,000 years ago. Geographers are interested in inter-regional, rural-urban, and urban-rural movements, especially in societies with low birth and death rates where migration is often the major cause of population change (see counter-urbanization). In 2008, about 3 per cent of Americans moved to another county, for example, and in China, it is estimated that there were 140 million migrants, mostly from rural to urban areas (Fan 2008).

The major focus of current geographical work, however, is international migration. It is estimated that there were 215 million people living outside their country of birth in 2010, around 3 per cent of the world’s population. But this surprisingly low number has disproportionate effects on

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