The Spanish Empire originated during the 15th century and lasted through the 20th century, reaching its peak of world domination under the Habsburgs. The House of Habsburg, one of the most powerful royal families in Europe, split into Spanish and Austrian branches in the 16th century, with Spain becoming the dominant faction. As the Habsburgs practiced inbreeding to maintain their lineage, it led to physical deformities and their eventual extinction due to a lack of heirs. The Spanish Empire explored, conquered, and colonized much of the Americas through conquistadors and administration by the Spanish monarchy.