WI: Portugal unites the 3 Iberian Crowns

I was just studying History for my test and a ideia kicked in my head

WI Afonso (son of King John II of Portugal) or Miguel, Principe da Paz, survive into adulthood and successfully inherit the Crowns of Portugal, Castille and Aragon at the same time.


Might be interesting the changes this could have brought to the whole Age of Discoveries and Colonization



So what are your comments and critics?


Pardon my English, i'm as some of you know Portuguese
By the way I'm still thinking about my previous TL but they're almost dead
 
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