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The process or act of movement by an individual or group from one country, region, or place to another, sometimes over long distances. Evidence of human migration has been found throughout history and prehistory. In the United States, for example, former slaves freed by the Emancipation Proclamation took part in the “Great Migration” from the south to the north. Migrations may be voluntary (e.g., in search of better living conditions, often from rural to urban areas) or involuntary (e.g., transportation of slaves or human trafficking). Migration is one of the driving forces of human evolution.