This map represents one of the first American attempts to translate census data into a visual representation on a map. It was created in 1861 by the U.S. Coastal Survey using statistical data from the 1860 census.
The map shows the percentage of enslaved people by county, with different colors reflecting the percentage. It provides a visual picture of how enslaved persons were distributed across the Southern States.
It was reported to have been a favorite map for President Abraham Lincoln to consult during the Civil War, and is depicted in Francis Bicknell Carpenter’s famous painting “
First Reading of the Emancipation Proclamation of President Lincoln.”