When the Spanish conquistadors first saw Tenochtitlan in 1519, they gasped in awe. The Aztec capital, built on an island in Lake Texcoco, was a city of 200,000 people — larger than Paris, rivaling Constantinople. It was a city of canals and causeways, of towering pyramids and floating gardens (chinampas), of dazzling markets where everything from obsidian knives to jaguar pelts to cacao beans was traded. The great Templo Mayor — the main pyramid — rose nearly 60 meters into the sky, its twin shrines dedicated to Huitzilopochtli (the god of war) and Tlaloc (the god of rain). The floors of the shrines were sticky with human blood, for the Aztecs practiced human sacrifice on a scale unique in human history. Every year, thousands of prisoners of war were led up the steps of the pyramid, their hearts ripped out, their bodies thrown down the steps. The Aztec Empire — the Triple Alliance of Tenochtitlan, Texcoco, and Tlacopan — was the dominant power of Mesoamerica, commanding tribute from 38 provinces and millions of subjects. And then, in August 1521, after a siege of 93 days, it fell. The last Aztec emperor, Cuauhtémoc, was captured and tortured. The city was razed. The Templo Mayor was demolished, its stones used to build the Cathedral of Mexico City. An entire world — the world of Mesoamerica — died in the flames of Tenochtitlan.
Summary: The Aztec Empire was a militaristic, tribute-based state centered on Lake Texcoco in central Mexico. It began expanding in 1428 under Itzcoatl. Montezuma II (r. 1502-1520) ruled at its height. In 1519, Hernán Cortés arrived with 500 Spanish soldiers. He allied with the Tlaxcalans and other native enemies of the Aztecs. Montezuma was killed (either by his own people or the Spanish). The Spanish and their allies laid siege to Tenochtitlan in 1521. After 93 days, the city fell. Cortés razed Tenochtitlan and built Mexico City on its ruins. The Aztec Empire was destroyed by European weapons, disease (smallpox), and indigenous allies who chafed under Aztec rule.
🐍 Montezuma and Cortés
In 1519, Hernán Cortés — a 34-year-old Spanish adventurer who had defied his own superiors — landed on the coast of Mexico. Montezuma II, the ninth Aztec emperor, was paralyzed by a combination of fear, fatalism, and the belief that Cortés might be the returning god Quetzalcoatl. He sent gifts of gold — hoping to appease the strangers — which only inflamed their greed. Cortés marched inland, gathering indigenous allies who hated the Aztecs. The Tlaxcalans — a Nahua people who had resisted Aztec domination — became his crucial partners. By the time Cortés reached Tenochtitlan, his army numbered thousands, the vast majority of them native warriors.
The Fall of Tenochtitlan — August 13, 1521
"The siege had lasted 93 days. The city was starving. The lake was filled with Spanish brigantines. Cuauhtémoc, the last emperor, tried to escape by canoe but was captured. 'Take me to Cortés,' he said. 'I have done everything in my power to defend my people. Now do with me as you will.' The great city fell. The Aztec world ended."
🦠 The Invisible Ally: Smallpox
A significant factor in the Aztec collapse was smallpox. A Spanish soldier carrying the virus introduced it to the mainland in 1520. The Aztecs had no immunity. The population of central Mexico collapsed from about 25 million to 1-2 million within a century. In some regions, the population fell to zero. The epidemic was a demographic catastrophe without parallel in human history.