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I'm planning a TL around the late 1820s, ITTL Pedro (the first of Brazil, fourth of Portugal) died in 1827, but his wife (Maria Leopoldina of Austria) lives on (IOTL she died in 1826) as regent of Brazil. I am focusing my research on the effects on South America, but I want to know your opinion about what would happen in the Liberal Wars in that situation.

So, the question is: What would happen in Portugal if Pedro died before the return of his brother Miguel to that nation? Would Austria get involved? I think that Maria Leopoldina would try to help her daughter, but would Metternich? Would Miguel even bother to rebel like IOTL?
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