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