Another thing .... the Egyptians and Aztecs had slaves do their stone carving and monument building for them. There is no Archaeological evidence that Native Americans ever took slaves. As I stated earlier ... they were more worried about basic survival. Although .... you have a very active imagination. Mother Nature created those 'carvings'.
Kentucky, I don't follow your logic. If the Ancient "monument builders" were as worried as you say about survival, they wouldn't have put slaves to work building pyramids and monuments. They would have engaged them in food production and processing, building shelter etc. Probably would have made more sense to turn them loose or kill them. Putting slaves to work building monuments would have just meant more hungry humans to feed.
People who worry about survival above everything else wouldn't have been able to stay put long enough to build monstrosities like the Pyramids at Giza. "Worrying about survival" means packing up and moving at least occasionally in search of food. Most likely the Ancients who had time to stay put for a century, were better fed, clothed and shelter than many people in this country at various times - like for example during the Great Depression when millions were unemployed, homeless and starving.
Its generally accepted today that the Egyptian pyramids were not built with slave labor. The workers were citizens who were paid, fed well, and had leisure time. The workers didn't spend their entire lives building monuments. It was probably somewhat similar to you or I joining the military, doing our time, and somebody else taking our place after our time was up. The pyramid builders probably working with a purpose and felt good about it.
When the first Europeans arrived in America they probably found people living as well as the average European, maybe better. If the Ancients in America were only worried about survival, how do you account for the mound builders? Visit Moundville in Alabama and you will change your mind.
About your assertion that Native Americans never took slaves - if there was warfare, which there was, there was slavery. To what degree and for what purpose would be the only questions.