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A Late Upper Paleolithic archaeologic site was identified at Cooper's Ferry in western Idaho in 2019. Based on evidence found at the site, the first people lived in this area 15,300 to 16,600 years ago, predating the Bering Sea land bridge by about 1,000 years. The discoverers, anthropology professor Loren Davis and colleagues, emphasized that they possess similarities with tools and artifacts discovered in Japan that date from 13,000-16,000 years ago. The discovery also showed that the first people might not have come to North America by land, as previously theorized. On the contrary, they probably came through the water, using a Pacific coastal road.