The Native populations of the Americas were much larger, more interconnected, more sophisticated before Columbus than they thought a few years back.

I really love to hear this. The Mayan culture is fascinating. If you ever get chance to see them I highly recommend it. Here is a picture of that stone ring that they throw a ball through. I say having a site built for sports makes them an advanced civilization. Blow it up so you can see it

We know less than 10 percent of actual real history of the world. A lot of secrets hidden under mountains, mounds, inside jungles, under sands or ice and below water too.