ZIEBACH COUNTY, S.D. — 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 percent of people live at or below the poverty line.At a time when the weak economy is squeezing communities across the nation, recently released census figures show that nowhere are the numbers as bad as here – a county with 2,500 residents, most of them Cheyenne River Sioux Indians living on a reservation.Read More... More on Economy