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I know that in OTL, the kingdoms of Castile and Aragon (in present-day Spain) merged in the late 15th-early 16th centuries, and that Portugal remained separate (except for a number of decades a bit later on) - as it does today. What if, though, Ferdinand and Isabella had never married and Castile never merged with Portugal either? How would the Iberian Peninsula shape up with three separate kingdoms/countries of Portugal, Castile, and Aragon down to the present day? What effect would that have on the Age of Exploration, the colonization of the New World, the Inquisition and expulsion of Jews and Muslims, and so on? (I didn't mention Navarre here because it's very small and would be easily swallowed up by Castile or something.)
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