The book contains all the modern, quite obviously racist canards, of the "paleoconservative" revisionism that is the raison d'etre of organizations like the Ludwig von Mises Institute and pseudo-scholars (and radically pro-Confederate racist revisionists) like Thomas J. DiLorenzo (see an interview with him here, and the Southern Poverty Law Center's description of modern Neo-Confederate intellectuals here). Slavery is not the cause of the Civil War, says Griffin, but the "legal plunder" of Northern industrialists against southern agrarians who desperately sought to invest their capital in more efficient resources than inefficient expensive slaves was the true cause. Despite the fact that he cannot even point to an old secondary source that contains such a reductio ad absurdum distortion of historical reality (and they certainly exist, see one of the few secondary sources he does use here), he also willfully ignores modern scholarship which is overwhelmingly based on the writings--public and private--of Southerners themselves to indict their vicious and callous and open pro-slavery motivations for rebellion. (For more on this, check out the Library of America series on Civil War writings from those who lived through the war.) Ron Paul has publicly endorsed these views as well, and I addressed them in very condemnatory language at the time.
(Mark Levin did a great segment on this very issue in August 2011. Do your own research!)