Collapse of Inca and Aztec

The Inca was a tribe native to Mesoamerica, and so were the Aztec. They lived like every ancient civilization. They grew crops, mostly maize, or corn. They once in a while had wars, and the Aztecs would rule all. The Aztecs had the best warriors around. The Incas had some of the good warriors too. The Eagle was the top warrior class and then there was the Jaguar. The people treated the warriors with respect and both tribes flourished in their doing so. The Inca was at their peek when they fell. The Inca fell because of the land. It became barren because they used it too much. They grew too much corn, and they never let the land rest. 
The Aztecs fall was way different from that.The Aztec was waiting for their god to return.