Stephanie Davidson and her husband, Gerald, look over fishing tackle inventory at their store in Eagle Butte, S.D., on Jan. 18, 2011. The Davidsons started a plumbing-and-heating business in 2000 that was hit hard by the recession and the limits of the reservation economy. They’ve filled space in their building by adding a bait shop and a café. In the barren grasslands of Ziebach County, there’s almost nothing harder to find in winter than a job. This is America’s poorest county, where more than 60 per cent of people live at or below the poverty line.