Seriously, why the fuck did the US not annex the CS after WW1? Anyway, what would the world and future events look like had they annexed them after WW1?
It might have worked if the Red rebellion had caused a lot more trouble and diverted more troops from the front. Allowing a more thorough victory, but the occupation would probably be costly and deadly.
Had Reds any other plans furhter to fight CSA government? Did they want create their own communist nation or did they ever want to join to USA?
I've got an outline for a TL-191 scenario where the Black Communists do a 'Long March' and concentrate in Mississippi/Alabama, where their local majority makes them much more effective at holding land against the CS Army and they do enough damage for Custer to break through in Tennessee in 1915, giving them a secure line of supply to the US and effectively cutting the CS in half. I think in that scenario, the US annexes Tennessee in addition to Kentucky, and Mississippi becomes a Red Black Republic (which the US maintains because it cuts the CS in half). Ultimately still doing its own thing, but given a fairly long leash and lots of supplies from the US because of how much their existence weakens the CS.When Cassius met with US troops to get weapons for his rebels, he straight up told them that the rebels were fighting for themselves not the US and that the revolution would come to the US in time as well.
"Cassius nodded. 'It's right, but we make dis revolution fo' our ownselves, not fo' you Yankees. Like I tol' you' sergeant here, one fine day you gits yo' own revolution."'
-American Front, Chapter XVI
Given Cassius is our viewpoint red leader, I think that suggests that the reds had no love for the United States and saw it as just a convenient, temporary ally and fully intended to establish their own communist nation.