Thank you, George, for this question. This is something I’ve been interested in for many years now.
According to this most recent article that I read on the subject, dated February of 2022, it looks like Native Americans began migrating from Asia around 36,000 years ago. I may expand on this answer later, but I will include the link to the article here.
https://www.sapiens.org/archaeology/ancient-dna-native-americans/
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