In this 2016 photo provided by Jason Packineau, Danielle Lucero, center, of Isleta Pueblo, New Mexico, speaks during Indigenous Peoples' Day at Harvard University in Cambridge, Mass. The clash between Massachusetts Sen. Elizabeth Warren and President Donald Trump over her Native American heritage highlights the varying methods tribes use to decide who belongs. The decision has wide-ranging consequences for Native American communities and their relationship with the federal government. (Jason Packineau/via AP)
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