The first Native Americans descended from a group of people who left northeastern Asia and spent thousands of years living in Beringia, the now-submerged landmass that once connected Siberia to Alaska. Genetic and archaeological evidence points to their arrival in the Americas at least 23,000 years ago, thousands of years earlier than scientists believed for most of the 20th century. These weren’t a single wave of explorers but a population that had been genetically isolated long enough to become a distinct group, carrying DNA mutations found nowhere else in the world.
An Ancient Siberian Ancestry
Genetic analysis of ancient teeth and bones has traced Native American ancestry back to a vanished group known as the Ancient Paleo-Siberians. These people were genetically distinct from the populations that became modern East Asians and modern Europeans. They lived in northeastern Siberia during the last ice age and eventually gave rise to the people who crossed into the Americas.
DNA studies have also identified a group called the Ancient Beringians, a previously unknown population whose remains were found in Alaska. This group split off early from other Native American ancestors, adding another branch to a family tree that turns out to be more complex than a simple story of one group walking across a land bridge. Still, the core finding holds: nearly all Indigenous peoples of North and South America trace their deepest ancestry to a single source population that evolved in isolation before spreading across two continents.
Thousands of Years Stranded in Beringia
The most widely supported model for how this happened is called the Beringian Standstill. The idea is that people leaving Asia reached Beringia before the worst of the Last Glacial Maximum, a period of extreme cold lasting roughly from 27,000 to 19,000 years ago. Once there, they couldn’t move south. An immense ice sheet covered most of Canada, blocking any route into the rest of the Americas.
So they stayed. For a very long time. Genetic estimates suggest they were cut off from their Asian source population for somewhere between 2,400 and 9,000 years, possibly as long as 15,000 years. During that isolation, their DNA accumulated mutations unique to the Americas. Researchers identified specific lineages in mitochondrial DNA (passed from mother to child) that are widespread across Native American populations but completely absent in Asia. All of these lineages show similar ages, roughly 13,900 years old, suggesting the founders spread across North and South America in a relatively rapid burst once the ice began to retreat.
Beringia itself wasn’t the frozen wasteland you might picture. Modeling of ancient vegetation suggests the most productive ecosystem sat along what is now the southern coast of Alaska. Pollen from birch and alder trees has been found in ice-age sediment drilled from the nearby sea floor, indicating relatively mild conditions in at least some areas. People could survive there, hunting large mammals and using coastal resources, even during the coldest centuries.
The Routes South
For decades, the textbook version said the first Americans walked south through an ice-free corridor that opened between two massive glaciers in central Canada as the ice age ended. That corridor would have become passable roughly 14,000 to 13,000 years ago, which aligned neatly with the Clovis culture, a widespread stone-tool tradition that was long considered the earliest in the Americas.
That timeline no longer works. Archaeological sites across the Americas now predate the opening of the corridor, which means at least some of the first people took a different path. The leading alternative is a Pacific coastal route. People could have followed the western edge of the Americas by boat or on foot along shorelines exposed by lower sea levels. Much of that coastline is now underwater, making direct evidence hard to find, but the dates from inland sites make a coastal entry increasingly difficult to dismiss.
Evidence Pushing the Timeline Back
The most striking recent discovery came from White Sands National Park in New Mexico. Fossilized human footprints found there were dated to between 23,000 and 21,000 years ago, placing people deep in the interior of North America during the Last Glacial Maximum. The initial dates, published in 2021, drew skepticism because they relied on seeds from an aquatic plant that can sometimes produce misleading radiocarbon results. But a follow-up study using terrestrial pollen from the same soil layers, along with a completely independent dating method based on light exposure in the sediment grains, confirmed the original timeline. Humans were in New Mexico while ice sheets still covered Canada.
White Sands isn’t alone. Bluefish Caves in Canada’s Yukon Territory contains animal bones with signs of human butchering that radiocarbon dating places at around 24,000 years ago, right in the heart of the ice age. If confirmed, this is strong evidence that people were living in Beringia during the coldest period.
Further south, the Monte Verde site in Chile has been a key piece of the puzzle for nearly four decades. Its main occupation layer dates to about 14,500 years ago, but deeper layers containing stone tools, animal remains, and burned areas have been dated between 18,500 and 14,500 years ago. The fact that people had reached the southern tip of South America by then implies they entered the Americas considerably earlier. In the eastern United States, Meadowcroft Rockshelter in Pennsylvania shows evidence of human activity going back nearly 16,000 years, with one artifact, a cut piece of bark possibly used as a basket, potentially as old as 19,000 years.
What Ancient DNA Tells Us
One of the most important genetic discoveries came from the remains of a young boy buried with Clovis stone tools near Wilsall, Montana, roughly 12,600 years ago. Known as Anzick-1, his genome was sequenced and compared to populations around the world. The results were unambiguous: he was more closely related to all Indigenous American populations than to any other group on Earth. His DNA showed virtually no genetic drift separating him from both Central American (Mayan) and South American (Karitiana) populations, meaning he belonged to a group that was directly ancestral to Indigenous peoples across the hemisphere.
This finding reinforced the picture of a single founding population that diversified after entering the Americas. It also confirmed a deep continuity between the ancient Clovis people and modern Native Americans, a connection that had been debated for years. The Clovis culture wasn’t the first in the Americas, but its people were part of the same family tree rooted in Beringia.
A Population, Not a Moment
Asking “who were the first Native Americans” is really asking about a population that formed over thousands of years in a place that no longer exists. They were descendants of Paleo-Siberian peoples who became genetically and geographically isolated in Beringia during the last ice age. They developed unique genetic signatures that persist in Indigenous populations today. And when the ice began to open pathways south, likely along the Pacific coast, they spread remarkably quickly, reaching Chile within a few thousand years.
The old model of big-game hunters crossing a land bridge around 13,000 years ago has been replaced by a more complex story: a deep-rooted population that was already in the Americas by at least 23,000 years ago, adapting to environments from arctic tundra to temperate forests to coastal deserts long before the famous Clovis spear points appeared in the archaeological record.