>>17788877
because civilization has nothing to actually do with some innate racial superpowers but has everything to do with population density. North America is a relatively flat continent and there was little geography that could've allowed a high enough population density to justify permanent city-states. Mesoamerica had this because there was a geographic bottleneck between the Gulf of America and the Pacific Ocean as well as dense jungles broken up by clearing

That being said, several native American tribes DID build permanent settlements, such as the Pueblo of New Mexico. In fact they build very elaborate cities that even included observatories for astrological events