There was after all tribal warfare, that killed more Native Americans than the Europeans ...There were Tee Pees and long houses.. there were various spoken languages but no written one ...there was a primitive culture .... How many years until that culture dicovered the world was round, that the earth revolved around the sun? No one knows ...The first thing a culture focuses on is survival from weather and enemies ...No all cultures are not equal
The Southwestern tribes spent hundreds of years trying to find meaning in the moon location (rather than just counting the full moons). If they had a common language, they would have realized this was a complete waste of time around 600 AD and spent their time doing more constructive things, like inventing the wheel or domesticating large animals.