Sanctuary city<span> is a name given to a city in the United States that follows certain procedures that shelters illegal immigrants.
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The Great Migration, or the relocation of more than 6 million African Americans from the rural South<span> to the cities of the North, </span>Midwest<span> and West from 1916 to 1970, had a huge impact on urban life in the </span>United States<span>.</span>
Humans tend to congregate and form settlements around areas that are rich with natural resources such as forests and rivers, because these locations support life and the economy.
