The Nuttall Encyclopedia
Calhoun, John Caldwell
An American statesman, born in S. Carolina, of Irish descent; all through his public life in high civic position; leader of "the States rights" movement, in vindication of the doctrine that the Union was a mere compact, and any State had a right to withdraw from its conditions; and champion of the slave-holding States, regarding slavery as an institution fraught with blessing to all concerned. His chief work is a treatise on the "Nature of Government" (1789-1850).
Wood, James, ed. Entry for 'Calhoun, John Caldwell'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/c/calhoun-john-caldwell.html. Frederick Warne & Co Ltd. London. 1900.