FILE - In this Dec. 4, 2016 file photo, protesters march at Oceti Sakowin camp where people have gathered to protest the Dakota Access oil pipeline in Cannon Ball, N.D. It has been called the largest gathering of Native American tribes in a century. Tribal members and others have joined in an ongoing, tense protest against the $3.8 billion Dakota Access oil pipeline, which the Standing Rock Sioux believes threatens sacred sites and a river that provides drinking water for millions of people. The protest is included in the AP top news stories in North Dakota this year. (AP Photo/David Goldman, File)

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