The Triple Alliance, also known as the Aztec Empire, was a Mesoamerican confederation of three city-states: Tenochtitlan, Texcoco, and Tlacopan.
The Aztecs originated in what is now Utah and migrated south to the valley of Mexico in the 12th century. They helped organize the overthrow of the Toltec civilization. Around 1325, the Aztecs built the city of Tenochtitlan on an island in Lake Texcoco, which the Tepanecs later conquered.
In 1426, the Aztecs of Tenochtitlan formed an alliance with the Texcoco and Tlacopan peoples and overthrew the Tepanecs. They waged war against neighboring nations until they controlled most of the Valley of Mexico. Tenochtitlan emerged as the dominant city-state and made its subjects pay tribute.
In the early 16th century, peasant rebellions against tributes weakened the Triple Alliance. Moctezuma Xocoyotzin came to power in 1503 and attempted to reform the empire, but the Spanish overthrew him and destroyed Aztec society in a genocidal three-year war. Indigenous opponents of the Aztecs allied with conquistador Hernan Cortés, but the Spanish colonizers later turned on them too.
The Aztec economy was based on irrigated agriculture. The main crop was corn, but they also farmed beans, pumpkins, tomatoes, tobacco, and cocoa. They also grew cotton to make cloths and clothing. They built large dams, canals, and fortresses out of stone. Aztec cities had complex internal markets.
- Roxanne Dunbar-Ortiz (2014). An Indigenous Peoples' History of the United States: 'Follow the Corn' (pp. 19–21). Boston, Massachusetts: Beacon Press.