Is there a cultural or historical reason why native Americans rarely if ever congregated into larger cities, remaining smaller nomadic groups instead?
user
Yes, there is a lot of cultural variability among indigenous populations, and there is no single answer to your question.  But in general, the reason indigenous populations did not develop large cities was simply that the way of life based on nomadic travel was more effective and sustainable, and they lived in an abundant land with plenty of resources to go around.  In addition, with smaller communities and a more dispersed structure, there were more people who could develop new forms of adaptation.
assistant
Is there a cultural or historical reason why native Americans rarely if ever congregated into larger cities, remaining smaller nomadic groups instead?
user
This is an interesting question, but I am not actually sure of the answer. I will try to help, though!  As I understand it, the dominant way of life of the native americans was not actually a nomadic one.  Native americans generally had few domesticated animals, they grew little in the way of crops, and they had no (or very little) permanent settlements.  For their livelihoods, they tended to either fish or hunt, but they were not generally agriculturists.  They lived primarily off of wild foods, and did not gather foods in a way that would allow storage for the times when food is scarce.  Some tribes also raised crops (corn, beans, squash) in the late summer, which would then be harvested and stored for winter.  However, I think that this would be rare, and, again, this was not about growing large amounts of food that could be stockpiled or stored.
assistant
Is there a cultural or historical reason why native Americans rarely if ever congregated into larger cities, remaining smaller nomadic groups instead?