A new analysis of hundreds of obsidian artifacts from the Aztec Empire has revealed the vast trade networks that supplied obsidian, sometimes even from rivals.

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To begin with, the mighty Aztec sustained their empire—the triple alliance of Tenochtitlan, Texcoco, and Tlacopan—for less than a century before it was eviscerated by European conquerors.

The discovery also sheds light on how the Aztec society evolved — introducing more standardized religion and control before the empire fell in 1521 — by showing how obsidian use changed over time.