Chief Arvol Looking Horse, spiritual leader of the Sioux Nation, leads his people to peacefully pray near a law enforcement barricade just outside of a Dakota Access pipeline construction site north of Cannon Ball, North Dakota, on Oct. 29, 2016.

Chief Arvol Looking Horse, spiritual leader of the Sioux Nation, leads his people to peacefully pray near a law enforcement barricade just outside of a Dakota Access pipeline construction site north of Cannon Ball, North Dakota, on Oct. 29, 2016.

Credit:

Josh Morgan/Reuters

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