Africa's Newest Failed State: How to Stop Civil War and Famine in South Sudan?

It's the third anniversary of independence for Africa's newest nation, South Sudan. With a brutal civil war now in full swing, the outgoing UN representative has pointed the finger at a "self-serving elite" responsible for a looming "man-made famine". What's gone wrong? How influent are regional players? And what does it all say about redrawing borders inherited from the colonial era?