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In 1479, the dynastic titles of the Crown of Aragon and the Crown of Castille merged, creating what would eventually become known as the Kingdom of Spain.

WI the Crown of Aragon never merged dynasties with Castille?

Admittedly, I don't know much about medieval Spanish politics. However, I'm interested in seeing how things would progress in Europe with a divided Spain. Would Castille attempt to militarily overthrow Aragon, or vice versa? How would the European Protestant nations progress without the Spanish, Catholic bogeyman? What about the discovery of the Americas?
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