History rarely follows the script. When Spain conquered the Aztec Empire in 1521, the conquistadors and Crown had goals—gold, souls, territory. But the collision of two worlds spun off outcomes nobody planned. Three stand out.
Established in 1571, the Holy Office of the Inquisition in New Spain was meant to police orthodoxy among Spanish settlers and convert Indigenous peoples. It did that—but it also became a machine for social control. Over nearly 250 years, it tried thousands: conversos (Jewish converts), Protestants, "idolatrous" Indigenous nobles, and later, Enlightenment thinkers. Intellectual life went underground. Scientific works circulated in manuscript, not print. The Inquisition didn't just suppress heresy; it delayed the arrival of modern science and critical thought by generations.
The Spanish brought few women. Conquistadors, soldiers, and settlers partnered—sometimes violently, sometimes stably—with Indigenous women. Their children, mestizos, were neither Spanish nor Indigenous in the eyes of colonial law. They occupied a liminal space: despised by peninsular elites as "impure," often rejected by Indigenous communities as outsiders. Yet by the late 18th century, mestizos outnumbered both "pure" groups. No royal decree created this demographic reality. It emerged from conquest's intimate violence and pragmatic survival. Today, mestizo identity is Mexico's core—a fusion forged in the cracks of empire.
The Church came to save souls. It stayed to run the colony. By 1800, the Church held roughly half the productive land in New Spain through mortgages (censos), haciendas, and urban real estate. It controlled education, hospitals, and the only legal marriage registry. Bishops and inquisitors often checked viceregal power. The Crown needed Church money for wars; the Church needed Crown protection for privileges. This symbiosis made the Church the colony's most durable institution—outlasting the viceroys, the Inquisition, and eventually Spanish rule itself. When Mexico erupted in 1810, the Church was the only national structure left standing.
None of this was in the Capitulaciones de Santa Fe. Conquest's unintended legacies—fear, mixture, institutional weight—still echo in Mexican courts, genomes, and parish registers today.