Washington D.C.: 1850s: The nation's capital is a center of the domestic slave trade; many lawmakers were slaveholders. Slavery is not abolished in Washington, D.C. until 1862. 1838: The Anti ...

This map, made by the U.S. Coast Survey in 1861 using census data from 1860, shows the relative prevalence of slavery in Southern counties that year. (Click on the image or on this link to arrive ...