It was necessary to put the South at a moral disadvantage by transforming the contest from a war waged against states fighting for their indepdence into a war waged against states fighting for the maintenance and extension of slavery...and the world, it might be hoped, would see it as a moral war, not a political; and the sympathy of nations would begin to run for the North, not for the South.

A History of The American Poeple (ed. 1903)