1808External slave trade outlawed.
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1820s–1830sSouthern legislatures enact slave codes. Southern intellectuals fashion systematic defense of slavery.
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1830Southern slaves number approximately two million.
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1836Arkansas admitted to Union as slave state.
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1840Cotton accounts for more than 60 percent of nation's exports.
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1845Texas and Florida admitted to Union as slave states.
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1860Southern slaves number nearly four million, one-third of South's population.
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