Britannica Sources used in this answer

How did the Aztec become the dominant power in central Mexico?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

A group of Native American men in colorful traditional regalia with feathered headdresses dance outdoors at a powwow ceremony on a grassy field. — Indigenous peoples of the Americas Performers at a Canadian powwow, c. 2008.

The Aztec rose to become the dominant power in central Mexico through a combination of strategic alliances, military conquest, and sophisticated sociopolitical organization.1

The Triple Alliance

Initially a nomadic tribe, the Aztec settled on an island in Lake Texcoco in 1325, founding Tenochtitlán. They initially served as a subject people to the Tepanec of Atzcapotzalco. However, under the ruler Itzcoatl (1428–1440), the Aztec formed a coalition with Texcoco and Tlacopan. This "Triple Alliance" broke the power of Atzcapotzalco and established the foundation for Aztec hegemony.123

Factors of Success

The rapid expansion of the empire, which eventually encompassed 400 to 500 states, was driven by three primary factors:31

Religion: War was a religious obligation to provide captives for sacrifice to the sun god Huitzilopochtli, which fueled military aggression.1
Economy: The Valley of Mexico supported a dense population through highly productive chinampas (raised-field agriculture) and extensive trade networks managed by powerful merchant guilds known as pochteca.1
Sociopolitical Organization: The Aztec developed a complex bureaucracy, including tax collectors and military garrisons, to manage conquered provinces and integrate them into their imperial structure.1