From Wikipedia (Human Migration):
Human migration is physical movement by humans from one area to another, sometimes over long distances or in large groups. The movement of populations in modern times has continued under the form of both voluntary migration within one’s region, country, or beyond, and involuntary migration (which includes the slave trade, trafficking in human beings and ethnic cleansing). People who migrate are called migrants or more specifically, emigrants, immigrants, or settlers, depending on historical setting, circumstances and perspective.
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