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What if the Reconquista stretched out longer and marriage alliances of Castille and Portugal were less successful, resulting in a Spain too distracted by events on the peninsula (and maybe in the Med) to undertake Atlantic expeditions and explorations?

Is there a plausible way to slow down Castille this much, perhaps by a hundred years, yet not slow down Portuguese seafaring and other European developments like the spread of the Renaissance, gunpowder weaponry and Gutenburg's printing press not at all?

If so, imagine the Portuguese discover Brazil while trying to round Africa, if not earlier.

With no comparable Castillian effort to sail west, and presuming no efforts by other European monarchies in northern Europe to send anything other than discreet fishing expeditions to the west, how long would it take the Portuguese to a) map the Brazilian coast, b) discover the Caribbean, c) discover Mesoamerica, d) discover Peru and e) subjugate or conquer any of the same?
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