Difficult to see how legalising secession would improve the US's situation right now.

Slavery was actually bad though and it's fascinating because one reads about all these deeply moral Americans who cared strongly about others, often along Christian lines, and you realise how deeply far the US has fallen culturally since doing something as intrinsically good as abolishing slavery. I mean can anyone imagine American society doing something as deeply good as abolishing slavery? The same people who elected Trump twice? I don't think so.