"Slavery is such an atrocious debasement of human nature, that its very extirpation, if not performed with solicitous care, may sometimes open a source of serious evils," Olmstead quoted this from Benjamin Franklin. In 1856, an Englishman, Frederick Law Olmstead, wrote A journey in the seaboard slave states. It is about his long journey in the seaboard slave states of Virginia, North Carolina,...