Members of the Standing Rock Sioux Tribal Nation, dance Friday, June 13, 2014 during a Cannon Ball flag day celebration, at the Cannon Ball powwow grounds at Cannonball, N.D. President Barack Obama and first lady Michelle Obama visited the reservation, his first trip to Indian Country as president and only the third such visit by a sitting president in almost 80 years. (AP Photo/Manuel Balce Ceneta)

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