Early Mesoamerican cultures like the Mayans, the Olmecs, and later the Aztecs remain shrouded in mystery. The Spanish who arrived in the 1500's apparently tried their best to bury and erase these mysteries further. But what’s been discovered indicates they were highly advanced civilizations that were intensely engaged with the cosmos and their living environment. They believed certain actions, like bloodletting or human sacrifice, could advance their world. But were their human sacrifice practices really any more strange or barbaric than other traditional notions of sacrifice?
https://www.artesmexut.org/part1