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The largest gathering of indigenous nations in modern American history has set up camp on land belonging to the Army Corps of Engineers and others at the confluence of the Cannonball and Missouri rivers in North Dakota. 

They have come by the hundreds to protest construction of the 1,172-mile Dakota Access oil pipeline, which would run within a half-mile of the Standing Rock Sioux reservation and cross beneath the Missouri River.

Opponents say the pipeline will adversely impact drinking water and disturb sacred tribal sites.

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