What did the European encounter mean for peoples of the major American empires?

BBy 1500 the Incas and Aztecs strained under the burdens of managing the largest empires the Americas had seen. Both faced the challenges of consolidating their gains, bearing the costs of empire and of the swelling nobility, and waging war in increasingly distant and difficult conditions.

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Past and Present Meet in Mexico CityConstruction for the Pino Suárez metro station unearthed the Aztec ceremonial altar of Ehecatl, the Aztec god of wind. (David Hiser/National Geographic/SuperStock)