The United States in 1857 — free states green, slave-holding states dark red if importing slaves, light red if exporting slaves — https://www.loc.gov/item/97682063/

The ten years between 1850 and 60 were good years for the American South: cotton, its main product, was in high demand, tariffs were low and getting lower, and politicians from the South controlled the US States Government. Money was rolling in — in 1860, the average male’s net worth was nearly twice as high in the South than in the North (McPherson, 1988, p. 115), but slavery, the ‘peculiar institution’ upon which the Southern lifestyle depended…