Expansion of the Aztec Triple Alliance

Timeline

1. 1440Tenochtitlan · Valley of MexicoAfter Itzcoatl's death, Moctezuma I acceded; the Triple Alliance completed its internal transfer of power and reaffirmed its alliances with Texcoco and Tlacopan.
2. c. 1443–1447Morelos and the Cuauhnahuac area · MexicoAlliance armies advanced south, conquering city-states such as Cuauhnahuac and bringing regions south of the Valley of Mexico under military control and the tribute network.
3. 1448–1449Valley of Mexico · Valley of MexicoNew vassal city-states paid tribute to the three capitals according to the alliance's terms, transforming the alliance from a regional coalition into an expansionist hegemonic structure led by Tenochtitlan.