| 1808 | - External slave trade outlawed.
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| 1810s–1850s | - Suffrage extended throughout South to all adult white males.
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| 1820s–1830s | - Southern legislatures enact slave codes.
- Southern legislatures restrict free blacks.
- Southern intellectuals fashion systematic defense of slavery.
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| 1822 | |
| 1829 | - Appeal . . . to the Coloured Citizens of the World published.
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| 1830 | - Southern slaves number approximately two million.
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| 1831 | - Nat Turner’s rebellion.
- First issue of the Liberator published.
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| 1836 | - Arkansas admitted to Union as slave state.
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| 1840 | - Cotton accounts for more than 60 percent of nation’s exports.
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| 1845 | - Texas and Florida admitted to Union as slave states.
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| 1860 | - Southern slaves number nearly four million, one-third of South’s population.
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