Declarations of secession do seem to frame the conflict in terms of Abolition and Anti-abolition states. Resolutions by the States of Georgia, Alabama and Texas come to mind.

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Several books and articles have outlined the rise of the Fire-Eaters from a small, inconsiderable political faction before 1850. You have commented on that in other posts. Certainly most Southern citizens would have identified themselves as strong Unionists before Lincoln's election. The sudden reversal of public opinion astonished and confused many career politicians.