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American statesman John Caldwell Calhoun (1782 - 1850), a vice-president under John Quincy Adams and Andrew Jackson and a defender of states rights and slavery. (Photo by Hulton Archive/Getty Images)

American statesman John Caldwell Calhoun (1782 - 1850), a vice-president under John Quincy Adams and Andrew Jackson and a defender of states rights and slavery.    (Photo by Hulton Archive/Getty Images)