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.