"Pushing the arrival of humans in North America back to over 30,000 years ago would mean that humans were already in North America prior to the period of the Last Glacial Maximum, when the Ice Age was at its absolute worst," Andrew Somerville says. "Large parts of North America would have been inhospitable to human populations." “Large parts of North America would have been inhospitable to human populations. The glaciers would have completely blocked any passage over land coming from Alaska and Canada, which means people probably would have had to come to the Americas by boats down the Pacific coast.” https://www.futurity.org/early-humans-bones-archaeology-mexico-2575302-2/?fbclid=IwAR2LY9APzfQSXSdNF_1PTjEodTdWGixOVaR6I39AflouQSh-CwLsTeb1WBg
