Previously, researchers thought that humans arrived in North America 13,000 years ago, but now they're finding much older evidence.
The arrival and establishment of humans in the Americas was a key step in humanity's trek across the planet, but exactly when this milestone was achieved remains hotly contested. According to the evidence we have now, when did the first humans arrive in North America?
In 2020, archaeologists digging in Chiquihuite Cave in the Astillero Mountains of central Mexico unearthed about 1,900 stone artifacts. Radiocarbon and optically stimulated luminescence dating of the objects suggested that humans might have occupied the area 31,000 to 33,000 years ago. When it comes to Chiquihuite, even the scientists who excavated the site noted that others might argue that the oldest stone objects discovered there are not of human origin but are merely"geofacts," or normal rocks that look artificial. A 2021 study from an independent group indeed made that argument.
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