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In page Loudoun County, Virginia:

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From 1890 to 1940, the county had a decline in population as people moved to cities for more opportunities.[citation needed] The decline was likely highest among African Americans, who had worked in an agricultural economy that was becoming increasingly mechanized.[citation needed] During the first half of the 20th century, African Americans moved out of rural areas to cities in the Great Migration.[citation needed] In the 21st century, African Americans now form a proportionally much smaller portion of the county’s population than they once did, and the Hispanic and Asian populations of the county outnumber them significantly.