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Moreover, recently discovered footprints in New Mexico, which are estimated to be around 22,000 years old, have added complexity to our understanding of the human timeline on the continent. As the evidence accumulated, it became apparent that human history in North America stretches back much farther than once thought.
New sites that have emerged—particularly near Pittsburgh Landing on the Columbia River—are challenging the notion of when and how populations first entered. This growing body of evidence suggests that these early inhabitants may not have traversed inland via the ice-free corridor as theorized. Instead, a new, fashionable concept known as the Kell Highway has gained traction among researchers.