The Aztec Empire grew from a three-city alliance
The empire often called “Aztec” took shape in central Mexico in 1428, when the Mexica city of Tenochtitlan joined forces with Texcoco and Tlacopan. The three rulers formed the Triple Alliance and defeated a powerful regional rival. Tenochtitlan soon became the alliance’s dominant partner, which is why its expansion is commonly described as the rise of the Aztec Empire.
Oxford, by contrast, was already a center of teaching by the late 11th century. The comparison is striking because it puts two very different institutions on the same timeline: a European school that developed over generations and a Mesoamerican empire assembled through conquest and political partnership.
Conquest turned alliance into an empire
The alliance did not govern every conquered community in the same way. Many local rulers remained in place, but were expected to send tribute—goods or labor owed to a superior power—and accept the alliance’s authority. Tribute could include food, textiles, precious materials, and other supplies. This system enriched the capital and tied distant communities to its power without requiring a single uniform administration everywhere.
That arrangement also created vulnerabilities. Subject communities could resent tribute demands, and the alliance depended on military strength and cooperation among its leading cities. When Spanish forces and their Indigenous allies attacked Tenochtitlan in 1519–1521, resistance to Mexica rule helped the invaders build coalitions against the empire. The political network that had enabled rapid expansion thus also gave some opponents reasons to join its overthrow.
