"John Caldwell Calhoun was a leading American politician and political theorist during the first half of the 19th century. Hailing from South Carolina, Calhoun began his political career as a nationalist, modernizer, and proponent of a strong national government and protective tariffs. After 1830, his views evolved and he became a greater proponent of states' rights, limited government, nullification and free trade; as he saw these means as the only way to preserve the Union. He is best known for his intense and original defense of slavery as something positive, his distrust of majoritarianism, and for pointing the South toward secession from the Union."