What if the completion of the Reconquista had gone differently?

Castile and Aragon take Granada, ending 780 years of Muslim rule in Iberia in the same year Columbus sails.

If it had gone differently: Spain stays preoccupied at home; there is no unified, militant, cash-strapped crown looking for a gamble across the ocean.

The real history on Wikipedia ↗

Later turning points that leaned on the completion of the Reconquista. Change it in the game and the ripples reach all of these.

1. 1492Columbus reaches the Americas. Without it, The Atlantic stays a barrier for generations; Europe's empires grow east, not west.
2. 1525The Atlantic slave trade scales up. Without it, The plantation economy never finds its labour force; Atlantic colonies stay marginal.