AHC: Spanish American Union?

Pretty sure this is impossible, so i'm not proposing a federal/centralized union. However, united so much that later down the road, when technology and economy would permit, the former Spanish colonies unite into one nation-state. Bonus points for Carribean colonies and Brazil being added into the fold.
 
I believe the 1812 Cadiz Constitution actually attempted that, trying to get the colonies to send representatives to the Central/Imperial Cortez, but it failed due to the extreme lack of proportional representation on the American side as well as the metropole's lack of respect for the Americans.
 
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