New Insights on Early Human Migration to North America
Researchers studying ancient DNA have made significant strides in pinpointing when early humans began migrating into North America, addressing a question that has perplexed scientists for many years.
A study, set to be published in the December 2026 edition of the journal Current Opinion in Genetics & Development, reviewed past genetic and archaeological findings to gain a clearer picture of when humans first entered the Americas.
The findings indicate that humans likely reached North America between 14,000 and 20,000 years ago, suggesting that their arrival occurred before 15,000 years ago is plausible.
Previously, it was widely believed that the first humans arrived in North America approximately 13,500 years ago, a theory referred to as “Clovis First.” However, new archaeological discoveries have challenged this, implying that human presence could predate this timeline by thousands of years.
Leading the research were Bethany Potter and Savannah Hay from the University of Kansas, who examined existing data, including 23,000-year-old human footprints found at White Sands National Park in New Mexico. These footprints hint that humans may have inhabited North America earlier than the current genetic evidence suggests.
The researchers theorize that these early populations might belong to genetic lineages that remain unexamined or that have no surviving descendants.
By comparing genetic data from ancient remains in both Asia and the Americas, the researchers traced early Indigenous populations and how they branched into distinct groups.
Some ancestral lineages are believed to have diverged around 21,000 years ago. The study also revealed the splitting of ancestral Native American populations into northern and southern groups about 15,500 years ago, likely occurring south of vast ice sheets that covered much of the continent at the time.
This indicates that their ancestors must have reached the continent before this split took place.
The findings challenge the long-standing “Clovis First” hypothesis, raising questions about the dynamics of human migration into the Americas. “Genomic data indicates a different picture; at some point, a small group of people likely entered the American continents without any other humans present,” the researchers remarked.
Still, they acknowledge that uncertainties linger regarding the timing and locations where early populations branched off.
Moreover, ancient DNA has been pivotal in other recent archaeological discoveries. Earlier this summer, for instance, researchers found ancient sheep pox virus DNA in a 1,000-year-old manuscript in England. In a related discovery in Chile, scientists identified smallpox DNA in mummies, marking the first genetic evidence of the disease in that area of South America.
