Answer:
The Reconquest, or "Reconquista", was completed in the year 1492, when the Spanish Kings Ferdinand of Aragon, and Isabel of Castille defeated the Kingdom of Granada, the last standing Muslim kingdom in the Iberian Peninsula.
Step-by-step explanation:
This was very significant because it marked the total expulsion of Muslims from the Iberian Peninsula, a land that had been inhabited by Muslim people since the 8th century. It also was the event that consolidated the Union between Castille and Aragon, and gave birth to the modern nation of Spain, and it provided the political capital to finance Christopher Columbus voyages in the same year, which would make both Spain and Portugal, the first modern European empires.