This map depicts the number of enslaved people in the United States in 1860.
In 1860, the final census taken before the Civil War showed the following population numbers:
Free States: 18,279,591
Slave States (free people): 9,902,988
Slave States (enslaved people): 4,000,000
What story is the map telling?
Where are the largest concentrations of enslaved people?
Compare the 1860 population data with Document 8a, a summary of the population in 1850. How do the numbers in Document 8a compare with the population representations in this map? What has changed – or not changed – in 10 years? How might any changes have affected congressional representation?