Ancient DNA narrows window for first human entry into North America
A new review of genetic and archaeological data suggests humans reached the Americas between 14,000 and 20,000 years ago, likely before 15,000 years ago.
A team led by Bethany Potter and Savannah Hay of the University of Kansas reviewed existing ancient DNA and archaeological evidence to reassess when the first humans entered North America. Their synthesis indicates that genetic data most strongly support an arrival between 14,000 and 20,000 years ago, with a pre-15,000-year entry being likely. The researchers cite 23,000-year-old human footprints at White Sands National Park as evidence that some early populations may belong to lineages not yet captured in genetic samples.
Comparative analysis of ancient genomes from Asia and the Americas reveals ancestral splits around 21,000 years ago and a later division into northern and southern groups roughly 15,500 years ago, implying that migrants were already on the continent before this split. The authors acknowledge remaining uncertainties about the precise timing and locations of these divergence events. The review appears in the online advance of the December 2026 issue of Current Opinion in Genetics & Development.
Why it matters
Understanding when people first arrived in the Americas reshapes theories of human migration and early cultural development.
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