Why can I write 'South' with some assurance that you'll know I mean Richmond and don't mean Phoenix? What is it that the South's boundaries enclose?

He has lectured at over 300 colleges and universities in the United States and abroad and held visiting positions at over a dozen including Fulbright lectureships in Israel and India and the Pitt Professorship of American History and Institutions at Cambridge University. He taught at the University of North Carolina at Chapel Hill from 1969 until his retirement in 2000 as William Rand Kenan Jr. from Columbia University in 1971.