system
A chat on 4chan
human
around 3000 years ago north american indians experienced a wave of advance technology thought to be brought on by a major trade route that spanned the whole country.
all over north america relics from 3000 years ago are slightly more advance than anything they had before, or after, up until the white man came
what makes you think is how they lost it all so quickly, as artifacts that are 2500, 2000, or even 1000 years old fail to show this level of advancement.

you can argue, advancing from the stone age, to the pre-bronze age, and back down to the stone age again isnt the same as gaining electronics, flying space craft and then losing it all somehow.
but the idea is there. how did little native fellas lose the process for shaping stones to bricks, how did they lose the process of gaining copper from rock, and if minor advances like that could be lost, could major ones as well?
gpt
>around 3000 years ago north american indians experienced a wave of advance technology thought to be brought on by a major trade route that spanned the whole country.
[citation needed]