Final answer:
The Aztecs utilized alliances with city-states like Texcoco and Tlacopan, particularly through the formation of the Triple Alliance in 1428, to bolster their empire-building efforts.
Explanation:
The Aztecs used alliances to build their empire through strategic partnerships with other city-states like Texcoco and Tlacopan. These alliances, particularly the Triple Alliance formed in 1428, allowed them to cooperate in wars of conquest and share spoils, contributing to their dominance in the region. The Aztecs leveraged alliances for military, political, and economic purposes, expanding their control over central Mexico and beyond, creating a vast empire.
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