What was one of the similarities of the maya's, the incas, and the aztecs?

There are many similarities but I have listed one below.

All 3 pre-columbian major civilizations the mayam the Maya, the Aztec, and the Inca were all without the one thing that we always see in early civilizations. It's a geographic feature which is a river. So there was no rivers. That in itself was very odd and rarely do civilizations develop without rivers.

the french attack on germany was caused by the military alliance

a system in which products were made rapidly by machines