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 ...

A map shows the distribution of the slave population in the Southern states of the United States, based on the 1860 census. Library of Congress Geography and Map Division As the 2016 election ...

Taken in all, the aggregate of slaves will be about 4,000,000. The census of 1860 will approximate, in regard to races, very nearly this proportion: Free white population..... 27,000,000.

Fascinating maps ... census data clearly show the spread of enslaved workers as agriculture pushed ever west The maps use dating stretching as far back as the first U.S. census in 1790 and show ...