South Sudan is in a tailspin. On July 9, the country commemorated its 4th anniversary of independence but it was hardly a celebration. Since December 2013 the country has been in a freefall stemming from when a political dispute between President Salva kiir and his rival Riek Machar turned into open conflict and civil war. Millions have been forced from their homes, a famine might loom over the country, and there is no end in sight.  Here to help explain how things went so badly, so quickly for this young country is Rebecca Hamilton. She's the author of the book Fighting for Darfur and professor at Columbia University's Law School.  Rebecca does a great job explaining the wider regional context of this conflict; and also showing how a government that was once championed by the USA fell out of favor with the Obama administration.