WI Maximilian of Mexico marries Amélia of Brazil

The Archduke Maximilian was engaged to Princess Maria Amélia of Brazil in 1852, but she died prematurely a year later of tuberculosis. The Princess was Dom Pedro I's only daughter by Empress Amélia, his second wife, and thus the half sister of Dom Pedro II, Emperor of Brazil. She would have no fertility problems, I'd think, since her father made some sixteen children with his various mistresses.

What changes could it bring to the choice of the Mexican Emperor if Maximilian is the brother-in-law of the Emperor of Brazil and already has a teenage heir? Would he be chosen at all, or would his throne befall another member of the dynasty? One of the determinant points for Maximilian accepting the throne IOTL was his travel to Brazil in 1860, where he witnessed the tropical monarchy's power and splendor Having married Amélia, the couple might even be living in Brazil when the time comes. And what implications does this marriage bring to the Mexico-Brazil relations? May we see some Brazilian ships aiding Maximilian in establishing the monarchy? What is the effect of no Charlotte?

As for the couple's happiness, I think it's pretty much guranteed since Amélia seems to be very beautiful, just like her mother, who managed to tame Pedro I the Womanizer himself.
 
I'm not sure it would help him. IOTL, despite the good relations between Pedro and Maximilian, Brazil never gave any official support (and never gave official recognition) to the Mexican Empire as it was seen by the Parliament as an illegal intromission of the French in the government of a fellow American country. If the Emperor had tried to force it because his sister was married to Maximilian he would only create a crisis between Parliament and Emperor, that would damage monarchy.

There was an interesting article about the rejection of Maximilian by the Imperial Brazilian government that was published some years ago by the National Library's Historical Magazine (unfortunately only in Portuguese): http://www.revistadehistoria.com.br/secao/artigos-revista/imperador-rejeitado
 
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