FILE - In this Aug. 26, 2016 file photo, Standing Rock Sioux Chairman Dave Archambault II poses for a photo near Cannon Ball., N.D., on the Standing Rock Sioux Reservation overlooking an encampment where Native Americans are gathered to join his tribe's growing protest against the Dakota Access oil pipeline. The reservation on the North Dakota-South Dakota border sits close to the pipeline's path. (AP Photo/James MacPherson, File)
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