The development most similar to Christopher Columbus's ideas in 1493 is the Reconquista.
The development most similar to the ideas expressed in Christopher Columbus's letter to Luis de Santangel in 1493 is:
the Reconquista, when Spanish Christians expelled Muslims from the Iberian Peninsula.
Christopher Columbus's letter reflects the religious conquest and the spreading of Christianity, which aligns with the religious motivations behind the Reconquista in Spain. Both events were driven by the desire to uphold Christianity and expand its influence.
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