History of the Aztec World
The Aztec empire grew from the politics of central Mexican city-states. Its principal alliance, formed in 1428, joined Tenochtitlan, Texcoco and Tlacopan, while numerous other communities retained local rulers under changing obligations. The Mexica rise and the empire’s defeat were both shaped by those relationships.
On this page4 sections
Settlement and remembered origins
Mexica origin accounts describe a migration from Aztlan under divine guidance. Painted histories connect movement, named places and sacred events. Aztlan’s location is not securely established, and these accounts also explain political identity rather than supplying a modern itinerary.
The conventional founding date of Tenochtitlan is 1325. Settlement on an island in Lake Texcoco placed the Mexica among older communities competing for land, alliances and authority. Early rulers obtained recognition partly through dynastic relationships and military service to stronger neighbors.
Defeating Azcapotzalco
The death of the Tepanec ruler Tezozomoc in 1426 helped provoke a succession struggle. Conflict with Maxtla of Azcapotzalco drew together opponents whose interests did not begin as one unified empire. Itzcoatl of Tenochtitlan and Nezahualcoyotl of Texcoco became central figures in the coalition that defeated Azcapotzalco in 1428.
Tenochtitlan, Texcoco and Tlacopan emerged as the partners of the Triple Alliance. Victories opened access to land, tribute and military support, giving further expansion material advantages. The partners retained separate ruling houses, and their influence was unequal rather than merged into a single dynasty.
Expansion and its limits
Under Moctezuma I, who succeeded Itzcoatl in 1440, imperial power extended beyond the Basin toward other productive regions. Tribute brought crops, cloth and valued materials into the capitals. Drought and famine in the mid-fifteenth century exposed the vulnerability of communities whose provisions were inadequate.
Tenochtitlan conquered Tlatelolco in 1473, increasing its control over the neighboring island city and its great market. Later expansion under Ahuitzotl, who ruled from 1486 to 1502, enlarged the tribute domain toward Guerrero and Oaxaca. Moctezuma II succeeded him in 1502.
Expansion never created an uninterrupted territory free of rivals. Tlaxcala remained independent, and the Purépecha state resisted conquest in the west. Rebellions and the need to maintain obligations also demanded continued military and political action within the imperial network.
The coalition of 1519–1521
Hernán Cortés’s expedition entered central Mexico in 1519 through negotiations, fighting and alliances. Indigenous participants had their own aims, including opposition to Mexica demands. Malintzin’s work as an interpreter helped negotiations across languages; the expedition’s progress cannot be explained solely by Spanish weapons or decisions.
The Spaniards reached Tenochtitlan in November 1519 and held Moctezuma under their control. Violence in 1520, including the attack on participants in the Toxcatl festival, intensified resistance. Moctezuma died amid the crisis, and the Spanish force and its allies were driven from the city.
Smallpox followed in 1520, killing people and weakening households and leadership. Cortés then assembled a larger coalition, including Tlaxcalan forces and allies from other communities. The siege of 1521 combined attacks along causeways with lake warfare, the disruption of fresh water and the restriction of provisions.
Cuauhtemoc was captured on 13 August 1521. Hunger, disease, destruction and sustained fighting had devastated the city. The defeat ended the Triple Alliance’s independent imperial rule but did not erase Nahua communities. Their subsequent histories continued under new authorities, through local politics, work, writing and adaptation.
For the wider setting, see Aztec History and Society.