 The land here in South Sudan is vast, is just as vast and flat. The 45,000 people around me share one single hand-pumped well drilled a decade ago by the U.N., and no other infrastructure beyond that. No buildings, no roads, no septic tank or sewer system, no schools, no clinics, no hospitals, no stores, or even storehouses. Nothing. The book is Threshold, the progressive plan to pull America back from the brink.