Research teams duel over Native American origins

Views differ on whether DNA analyses support one or two ancestral populations

Native Americans' origins

ONE WAVE  A single group of people migrated from Siberia and Northeast Asia into the Americas via a land bridge about 23,000 years ago, giving rise to all Native Americans, one group of researchers says. Another group of researchers has a slightly different view.

Raghavan et al/Science 2015

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