States' rights
The fourth theory was advocated by Mississippi Senator Jefferson Davis, one of state sovereignty ("states' rights"), also known as the "Calhoun doctrine", named after the South Carolinian political theorist and statesman John C. Calhoun. Rejecting the arguments for federal authority or self-government, state sovereignty would empower states to promote the expansion of slavery as part of the federal union under the U.S. Constitution. "States' rights" was an ideology formulated and applied as a means of advancing slave state interests through federal authority. As historian Thomas L. Krannawitter points out, the "Southern demand for federal slave protection represented a demand for an unprecedented expansion of Federal power." These four doctrines comprised the dominant ideologies presented to the American public on the matters of slavery, the territories, and the U.S. Constitution before the 1860 presidential election.