For example?
Sorry, N-S, but I won't accept a homework assignment of digging through your post. A fair reading of your posted quotations from Southern secessionist orators supports multiple motives, rather than McPherson's "it was slavery and nothing but slavery" mantra, which is a polemical lie -- polemical, in that McPherson is attempting to attach a moral stigma to every Southern leader and soldier, and by extension -- more importantly -- to every Southerner now living, who has not slavishly grasped the knees and kissed the ring of the triumphalist faction and the Power they serve.