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I recall that, some time after 1864, some Radical Republicans were seriously proposing to redraw the borders of the ex-Confederate states. OTL, of course, the idea was dropped and nothing came of it. What situations could lead to it actually going through?

I'm not just talking about splitting off the State of Franklin; I'm talking about redrafting most of the borders - there may still be a state of North Carolina, but it might not include the mountains, might contain half of Virginia, etc. I'd prefer a PoD after 8 June 1861 (when Tennessee, the last Confederate state, seceded), but minor PoD's beforehand are acceptable as long as major events continue as OTL through then.
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