What did Isabella I achieve?

Isabella I of Castile, who reigned from 1474 to 1504, is best known for unifying Spain through her marriage to Ferdinand II of Aragon, leading to the establishment of a unified Spanish kingdom. She played a crucial role in the completion of the Reconquista with the conquest of Granada in 1492, which marked the end of Muslim rule in Spain. Additionally, her support for Christopher Columbus's voyages led to the discovery of the New World, significantly expanding Spain's influence and wealth. Isabella also implemented reforms in the Spanish government and church, promoting a centralized monarchy.