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).