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Migration is the spatial change of a person’s residence. If this change of residence is between different countries, it is called international migration, while a change of residence within a country is defined as internal migration. With the focus of the definition on the change of residence, the term migration is a specific form of the more general term mobility, which includes spatial movement in general, such as to commute from the residence to the workplace.

The United Nations reported that in 2013 the world’s population of migrants totaled around 232 million. However, defining what it means to be a migrant is complicated for several reasons. How long does a person need to have been in a country before he or she is no longer considered ...

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