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(second attempt)
What is the latest PoD that allows the Brazilian Imperial government to survive at least until, say, 1921?
Ideally, I'd like the PoD to be after the Rio Branco law in 1871. Bonus points if you can do this and end slavery in Brazil earlier than OTL.
I am actually aware of one TL that does this -- The Discord that Follows -- but it's a lot more than what I'm looking for...
EDIT CLARIFICATION: Yes, this is a second attempt at this thread; I'm doing this in response to comments in the original to the effect that the acronym in the title was off-putting to responses...