You don't need to remind me. I've always found this line of reasoning absurd, as if the Confederacy would be a static society as the world moved on around them. I'm not saying the Confederacy wasn't founded to maintain slavery, or that the institution was enshrined in its constitution. I'm arguing that to say the Confederacy would maintain slavery even after it is no longer viable is a ridiculous notion. It's not like reform is impossible. The People's Republic of China was founded on communist principles, but it reformed in the face of necessity. Eventually, the most ardent proponents of slavery would die away, newer generations would free their slaves because it's criticized by foreign press and it's no longer economically viable, and eventually they'd just ban the institution in exchange for a trade deal with Britain or something. The CSA wasn't some single-minded collective consciousness dedicated to the sole purpose of enslaving black people.
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I doubt the Confederacy would enter an alt-Great War. Since they would be considered a pariah for a long time, they wouldn't have any allies in Europe to fight for.