To be thorough one needs to observe that 3,000 years ago human sacrifice was also being practiced in Europe and elsewhere. The folks in Sourh America just didn’t have access to peat bogs.
Europe never had the massive executions and sacrifices that happened in South America.
What happened in South America was on a much different scale.
“Many reputable scholars today put the number between 20,000 and 250,000 per year for the whole Aztec Empire.”
https://www.historyonthenet.com/aztec-culture-how-many-were-killed-as-human-sacrifices/
I suppose we would want to open our borders to the descendants, after all the USA is becoming heavily populated.We may need a population adjustment.
The witless superstitions of humans worldwide resulted in a lot of scapegoating for crop failures and droughts and such. Oddly, the surviving nitwits never noticed that there's no connection between cutting someone's throat and the climate (even though modern liberal fans of Genghis Khan think there is).
The Aztecs had an insatiable appetite for the mass butchery of captives (the called their conflicts "Flower Wars", a really hippie-sounding take on it) in their effort to feed the Sun with blood. On the plaza in front of their big pyramid in Tenochtitlan they had a structure they called "the corncrib", and it was filled with the defleshed remains of approximately 250,000 victims.