Ancient humans arrived in South America in multiple waves
Paleoamericans share a last common ancestor with modern native South Americans outside, rather than inside, the Americas and new findings underscore the importance of looking at both genetic and morphological evidence, each revealing different aspects of the human story, to help unravel our species' history. Ref. Source 7z.
This is fascinating and it shows we're all fairly recent immigrants to the Americas when the totality oh human existence is taken into account.
Yes most of the world was settled with a mass movement of people looking for a different or better life in a far place where no one has been before. This is how we developed to be different in many ways but still all the same. Our ancestors spread across the world when it was a much different place. It has given us the people of today and how we are all the same but still different.