The Islamist group Boko Haram has been launching increasingly frequent and deadly attacks in northern Nigeria over the past year, and has recently expanded into Chad, Niger, and Cameroon. Over 1 million people have been forced to flee their homes, just as Nigeria prepares for a general election. Watch the video above to learn about the roots of unrest in Nigeria.
The crisis in Nigeria, in 11 maps and charts
The real roots of Nigeria's Boko Haram problem
Both sides are losing in Nigeria's war on Boko Haram. Who will lose faster?