Slavery

Here is a map from 1861 showing the slavery in Georgia.

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This map shows the spread of U.S. Slavery from 1790-1860.

This animation shows the rate of slavery between 1790 and 1860 for enslaved people/mile.

This animation shows the rate of slavery between 1790 and 1860 for the percent of population that is enslaved.

Source: http://www.smithsonianmag.com/history/maps-reveal-slavery-expanded-across-united-states-180951452/