Standing Rock protests against the Dakota Access Pipeline

CANNON BALL, ND - DECEMBER 5: On the day of a government order to vacate the area, hundreds of United States military veterans vow to defend the Standing Rock protest camp and march through a winter blizzard to the scene of recent clashes with state police and the national guard just outside of the Lakota Sioux reservation of Standing Rock, North Dakota, December 5, 2016. Over two hundred tribes, joined by environmental activists and hundreds of United States military veterans, camp and demonstrate against the Dakota Access Pipeline, which plans to be built under the Missouri River adjacent to the reservation. The gathering has been the largest meeting of Native Americans since the Little Bighorn camp in 1876. (Photo by Andrew Lichtenstein/Corbis via Getty Images)