Final answer:
The Incan and Aztec empires both used innovative agricultural techniques to increase food production.
Step-by-step explanation:
A similarity between the Incan and the Aztec empires is that both used innovative techniques to dramatically increase agricultural production.
The Incan Empire used a system of terracing to grow crops in the mountains, while the Aztec Empire built floating gardens called chinampas to cultivate crops in the lakes of the Valley of Mexico.
These agricultural advancements allowed both empires to support large populations and develop complex societies.
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