If you balkanize Brazil you could have slavery last almost indefinitely in South America
The tricky part is that a couple of our rebellions were against slavery(Farrapos the main one) but it could still work
Paraguay could certainly take advantage of that in their fantasies of Empire building that might not be so much a fantasy anymore, and considering they still held upon slavery while also having a serfdom-like system and the Lopez Family owned not only the government but pretty much all of the country's land North Korea style it might for the best to keep them around as much as having Paraguay be wiped out may be tempting when trying to create the most dystopic 19th century
The tricky part is that a couple of our rebellions were against slavery(Farrapos the main one) but it could still work
Paraguay could certainly take advantage of that in their fantasies of Empire building that might not be so much a fantasy anymore, and considering they still held upon slavery while also having a serfdom-like system and the Lopez Family owned not only the government but pretty much all of the country's land North Korea style it might for the best to keep them around as much as having Paraguay be wiped out may be tempting when trying to create the most dystopic 19th century