"Every day is a test of endurance on the [Standing Rock Sioux] reservation, which encompasses 3,600 square miles of windswept prairie in North and South Dakota. Freezing in winter, baking in summer, the reservation's residents brave the elements in clusters of trailer parks and prefabricated homes. Some 40 percent of its 8,200 people live below the poverty line. Like other Native American communities, Standing Rock suffers from high rates of unemployment, alcoholism and suicide. The health care system is a shambles, and housing is so scarce that multiple families often cram into a single dwelling."