1860 census map shows where Missouri’s slave population resided

The New York Times published a great story last week about a map of the South from 1860 census — the last to tabulate slave populations — that illustrates Missouri’s slave population just before the Civil War.

University of Denver history professor Susan Schulten writes that the county-by-county map of 15 states, which was noteworthy for using the funky new concept of shading to show higher concentrations of slaves, validated Union politicians’ theories that slavery was the dominant cause of the war.

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