Ferdinand and Isabella used Catholicism to ruthlessly impose religious conformity in 15th century Spain. They forcibly converted or expelled Muslims and Jews to create a solely Catholic kingdom. This policy of "ethnocide" aimed to cleanse the world of other faiths and establish "one faith." The Spanish monarchs also implemented a caste system in New Spain that privileged those of pure Spanish blood and Catholic faith over mixed or indigenous peoples. There was ongoing debate between those who felt the natives should not be enslaved according to God's will, and those who prioritized exploiting them for gold and silver to enrich the Spanish empire. Charles V exacerbated this by forcing indigenous peoples to mine silver in Potosi, resulting