| http://www.w3.org/ns/prov#value | - Some historians differentiate between the first Great Migration (1910???1930), numbering about 1.6 million migrants, who left mostly rural areas to migrate to northern and mid-western industrial cities, and after a lull during the Great Depression, a Second Great Migration (1940 to 1970) in which 5 million or more people moved, including many to California and other western cities.
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