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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →A 2026 review suggests that ancestors of contemporary Indigenous peoples were in the Americas by roughly 21,000 years ago, likely near the end of the Last Glacial Maximum. That is an estimate about ancestry—not a direct date for the first human arrival—and the review’s authors leave open the possibility of earlier migrations.
What does the 2026 review suggest?
Potter, Hay, Singh and Raff’s review, Genomic insights regarding early migrations into the Americas, appeared online on September 23, 2026, in Current Opinion in Genetics & Development. It assesses migration models using genetic, archaeological and environmental evidence; it is a synthesis of existing work, not a newly reported excavation or a direct measurement of when people crossed into the Americas.
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Live Science, reporting the co-authors’ interpretation, says the genetic evidence places ancestors of contemporary Indigenous peoples in the Americas no earlier than about 21,000 years ago, likely toward the end of the Last Glacial Maximum. Co-authors Bethany Potter and Savannah Hay cautioned: “The evidence points to the arrival of humans ancestral to contemporary Indigenous peoples likely near the end of the Last Glacial Maximum, but earlier migrations may also have occurred.”
How does that timing compare with the proposed arrival windows?
The Last Glacial Maximum (LGM), the coldest interval discussed in this debate, is dated to about 26,500–19,000 years ago in the 2026 Live Science report and a 2020 Nature analysis. The models below describe broad proposed windows, not equally certain or mutually exclusive dates.
#1 Best Overall
| Proposed window | Approximate timing | What the model addresses |
|---|---|---|
| Before the LGM | More than 25,000 years ago | Whether people were present before the coldest interval; this possibility remains open even though the reported genetic inference for ancestors of contemporary Indigenous peoples is later. |
| During the LGM | Roughly 25,000–14,000 years ago | Whether arrivals occurred during the glacial interval or as it ended. The review’s reported estimate of about 21,000 years ago falls within this broad window. |
| After the LGM | More recently than 14,000 years ago | A later-arrival model sometimes called “Clovis First.” It does not capture all archaeological evidence for earlier human presence. |
Why isn’t 21,000 years ago a firm date for the first arrival?
The estimate is an inference from an incomplete genetic record, not a genome sampled from a person who arrived at that time. According to Live Science’s account of the review, the researchers considered about 250 published whole genomes and genome-wide data from around 1,200 ancient Indigenous individuals. They also noted that no published ancient genomes from the Great Plains were available to them. Potter and Hay described the problem plainly: “There are huge gaps in our genetic dataset.”
The earliest sampled genome discussed in the report is from Anzick-1, an individual who lived in what is now Montana about 12,800 years ago. Potter and Hay’s roughly 21,000-year estimate is extrapolated from Anzick-1 and other early ancestors; it is not the age of a directly observed migration. Missing regions or populations could change what can be inferred, and the available genomes cannot rule out people whose descendants were not sampled or who left little detectable ancestry in the populations represented.
What do the White Sands footprints add?
Footprints in White Sands, New Mexico, have been dated to around 23,000 years ago. If that dating is correct, people were present in the Americas before or during the LGM—earlier than the review’s reported genetic estimate for ancestors of contemporary Indigenous peoples.
The genetic record does not currently establish that the people who made the footprints contributed significantly to the ancestry of contemporary Indigenous peoples. That absence of a clear signal is not proof that they left no descendants: those descendants may not have been sampled, or their contribution may have been small. The co-authors also told Live Science that Acoma Pueblo people recognize the footprints as traces of their ancestors; that community perspective should be understood on its own terms, rather than treated as settled or dismissed by the limits of current genetic sampling.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why can archaeological evidence point to earlier people?
A 2020 Nature analysis modeled chronological data from 42 archaeological sites in North America and Beringia. It concluded that people were probably present before, during and immediately after the LGM, while widespread occupation began later, during abrupt warming. This concerns evidence for human presence at sites. It does not directly answer when ancestors of living Indigenous peoples arrived, so it need not contradict the more narrowly framed genetic inference.
A 2023 review of Beringia—the region connecting northeastern Asia and northwestern North America during periods of lower sea levels—describes competing ideas about environments, migration routes and the North American ice sheets. Those routes and their timing remain debated; the 2026 review’s reported genetic estimate does not establish a single path or settle that debate.
Quick Recap
What the evidence does—and does not—say
- It suggests: ancestors of contemporary Indigenous peoples were present by about 21,000 years ago, likely near the end of the LGM.
- It does not establish: that 21,000 years ago was the first human arrival, or that all earlier people were ancestors of living Indigenous peoples.
- It leaves unresolved: how much earlier populations contributed to later ancestry, in part because ancient genomic sampling is geographically incomplete.
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