What pre-condition had to be accomplished on the Iberian Peninsula before Portugal and Spain could unify internally as nations?

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The Iberian Peninsula, where modern-day Spain and Portugal are located, was under Islamic rule for centuries. Before these countries could unify and form cohesive national identities, they had to reconquer and consolidate territories controlled by Muslim rulers, a process known as the Reconquista. This was a prerequisite for their internal unification and the establishment of centralized monarchies.

What Pre-Condition Had to Be Accomplished on the Iberian Peninsula