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Here's The Map That Lincoln Used To See The Reach Of Slavery

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Here's The Map That Lincoln Used To See The Reach Of Slavery

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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 at a larger, zoomable version.)

BigSlaveryMap

Library of Congress, American Memory Map Collections

Map shows how the slave population was distributed. Compiled from the census of 1860. Drawn by E. Hergesheimer. Engr. by Th. Leonhardt.

The map, which shades counties based on the percentage of total inhabitants who were enslaved, shows what a range there was in levels of Southern enslavement. Some counties, the map explains, "appear comparatively light … this arises from the preponderance of whites and free blacks in the large towns in these counties." The population of Orleans Parish, La., in one example, was 8.9 percent enslaved. Places that were rural but were located in mountainous areas devoid of plantations were similarly light-shaded: The people of Harlan County, Ky., were 2.3 percent enslaved.

Meanwhile, a dark belt of counties bordering the Mississippi River held more than 70 percent of their residents in slavery, with Tensas Parish, La., at 90.8 percent and Washington County, Miss., at 92.3 percent.

Historian Susan Schulten writes in her book Mapping the Nation: History and Cartography in Nineteenth-Century America that during the 1850s many abolitionists used maps to show slavery's historical development and to illustrate political divisions within the South. (You can see many of those maps on the book's companion website.)

Though this map was simple, it showed the relationship between states' commitment to slavery and their enthusiasm about secession, making a visual argument about Confederate motivations.

Schulten writes that President Lincoln referred to this particular map often, using it to understand how the progress of emancipation might affect Union troops on the ground. The map even appears in the familiar Francis Bicknell Carpenter portrait First Reading of the Emancipation Proclamation of President Lincoln, visible leaning against a wall in the lower right-hand corner of the room.

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