How do you know? Were you there to watch them form?
https://anthropology.net/2008/05/08...ence-of-americans-found-in-monte-verde-chile/
Earliest known archaeological evidence of Americans found in Monte Verde, Chile
08
Thursday
May 2008
Posted by Kambiz Kamrani in Archaeology, Blog≈ 8 Comments
TagsArchaeology, chile, monte verde, peopling of the americas, radiocarbon dating
Monte Verde, Chile is a very interesting archaeological site. First discovered in 1976, the site is about 500 miles south of Santiago and has yielded artifacts of a small settlement of 20 to 30 people living in a dozen huts along a small creek. Aside from artifacts, a wide variety of midden has also been unearthed from the site indicating these people survived on extinct species of llama, gomphotheres, shellfish, vegetables and nuts.
In 1979, Tom Dillehay conducted radiocarbon dating of the bones and charcoal found at Monte Verde. The results were shocking at the time. The dating of the organic materials was at 14,000 years before the present.
https://en.wikipedia.org/wiki/Kennewick_Man
The biological diversity among ancient skulls in the Americas complicated attempts to establish how closely Kennewick Man is related to any modern Native American tribes.[16] Skulls older than 8000 years old have been found to possess greater physical diversity than those of modern Native Americans. The origin of that diversity, whether from different lineages or local adaptation, is a matter of debate.
https://en.wikipedia.org/wiki/Clovis_culture
The Clovis culture is a prehistoric Paleoamerican culture, named for distinct stone tools found in close association with Pleistocene fauna at Blackwater Locality No. 1 near Clovis, New Mexico, in the 1920s and 1930s. It appears around 11,500–11,000 uncalibrated RCYBP[1] at the end of the last glacial period, and is characterized by the manufacture of "Clovis points" and distinctive bone and ivory tools. Archaeologists' most precise determinations at present suggest this radiocarbon age is equal to roughly 13,200 to 12,900 calendar years ago. Clovis people are considered to be the ancestors of most of the indigenous cultures of the Americas.[2][3][4]