>>4279
Playing devils advocate here, I'll guard my own opinion:
While they had a plethora of fruits and vegetables, they had but two domesticated animals. The llama and turkey.
They had no pack animal, llamas can only carry 80 pounds.
They had no riding animal, llamas will not stand even a child on their backs.
They had no milk making animal.
They had no plow pulling animal.
They were limited to what their own bodies could do. One might say this put them in a Greek situation, but Greece had the benefit of sheep and cattle still, not to mention trade with most of the established civilizations. I believe a better comparison would be to the British isles before Roman conquest, getting by took up most of their time until someone else introduces the tech jump they needed to get ahead. One could say the Amerindians were not so hard pressed, but I remember seeing some new theories as to why the oldest civs there failed; their population increased so much that they could not sustain a food supply, resorting to crushing low calorie tree nuts. Literally everything in meso-america was carried by men, so there is only so far farms can reach and hunters can forage protein before they reach a limit. A generation fleeing as far from a capitol as humanly possible, that is bound to have negative effects on development.
Guess what I'm trying to say is they only had themselves. That they did what they did with only their own thoughts and hands is remarkable. Hieroglyphs, mathematics, calenders & astronomy, crude brain surgery, maintained road networks, highly developed political systems, detailed metal smithing, long distance trade networks, and a developed understanding of architecture all without any precedent or inspiration from others. Something we can't say of certain about any civilization of the old world.
2670 BC
First pyramid of Egypt
Around this time in America the Olmecs were just starting out. I find this notable in that humanity had not been settled in america nearly as long as Northern Africa.
Yellow, hunter gatherers. Green, simple farms. Red, complex farms.