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The scenario is complex, but plausible and rather easy to understand:
- South wins Civil War, that's not the big deal
- CS constitution is a looser union than the US "already" was, so we are to see its dismemberation
- The independant CS breakaways are to see the fate of Texas, so they are to rejoin the US volontarily and deliberately without demanding pro-Southern terms to join.
All of the South is supposed to be completely absorbed into the US again no later than 1900. But keep it as plausible as possible.