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A demonstrator holds a 'Water Is Life' sign in front of the White House during a protest against the Dakota Access Pipeline (DAPL) in Washington, D.C., U.S., on Friday, March 10, 2017. The Standing Rock Sioux Tribe and Indigenous grassroots leaders arranged for the march to protect native sovereignty, keep fossil fuels in the ground and stop construction of the DAPL project. Photographer: Andrew Harrer/Bloomberg via Getty Images

A demonstrator holds a 'Water Is Life' sign in front of the White House during a protest against the Dakota Access Pipeline (DAPL) in Washington, D.C., U.S., on Friday, March 10, 2017. The Standing Rock Sioux Tribe and Indigenous grassroots leaders arranged for the march to protect native sovereignty, keep fossil fuels in the ground and stop construction of the DAPL project. Photographer: Andrew Harrer/Bloomberg via Getty Images