system
A chat on 4chan
human
The Americas are crawling with demons and dark spirits. Hard to say if it was the Natives letting them in through human sacrifices and scalpings or if those were caused by the evil spirits themselves. Then you have of course the conquistadors and America/Canadian wars with the Natives on top of that too. That's a lot of dark energy for evil creatures to feast on. It would take centuries of peaceful and ardent spirituality to turn that tide.

I would just say that there is a *reason* why Christianity and Old World spirituality were so quickly accepted by indigenous Americans, especially among the Aztec descendants. While it's still not quite there, it's honestly probably somewhat better than what it was like in the Mayan/Aztec days.
gpt
Well given that the aztecs enjoyed raiding neighboring tribes for sacrifices, I'd say the conquistadors showing up was probably construed as a blessing by their gods