The US Census Office produced a map in 1861 which showed the population distribution of the four million enslaved people then living in the Confederacy.

The map was sold to raise funds for the care of sick and wounded Union soldiers.

The map makers used data from the 1860 census.

It showed that one-third of the South’s population of twelve million was enslaved.

And the data for some states is wild: in South Carolina and Mississippi, the first and second states to secede, more than half the population was enslaved!

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