Why is Libya falling apart?

Western powers are concerned that the fractured nation in North Africa is fertile ground for Islamic State militants.

Esam Omran Al-Fetori/Reuters/file

Since Muammar Qaddafi’s death in 2011, gangster-style militias in Libya have proliferated and are fighting over oil as two rival governments compete for control. Now the self-described Islamic State has arrived to try to put down roots and recruit militants. How did the country get to this point, and are there any signs of stability or even peace?