The most formidable of all the ills that threaten the future of the Union arises from the presence of a black population upon its territory; and in contemplating the cause of the present embarrassments, or the future dangers of the United States, the observer is invariably led to this as a primary fact.
Alexis de Tocqueville, Henry Reeve, Francis Bowen, Patrick Renshaw (1998). “Democracy in America”, p.140, Wordsworth Editions
