And that has to ignore the elephant in the room ...
If CSA defeats the Union and just some 20 to 30 years picks a war with a neighbor the temptation for the rump USA to restart the war would be ... rather high.
Also, Mexico was rather neutral tending to pro USA in the OTL war ... in a CSA case were probably their relations are already very low ...
It could be very well a case of shooting oneself on the foot.
If CSA defeats the Union and just some 20 to 30 years picks a war with a neighbor the temptation for the rump USA to restart the war would be ... rather high.
Also, Mexico was rather neutral tending to pro USA in the OTL war ... in a CSA case were probably their relations are already very low ...
It could be very well a case of shooting oneself on the foot.