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What does Boko Haram’s pledge of allegiance to ISIS really mean?

Here's a comprehensive guide to what we know about the terror group's pledge of allegiance and what questions remain.

A Chadian soldier peers into a burnt armored vehicle, which the Chadian military say belonged to insurgent group Boko Haram, after the Chadians destroyed it during battle in Gambaru, Feb. 26, 2015. (Photo by Emmanuel Braun/Reuters)
A Chadian soldier peers into a burnt armored vehicle, which the Chadian military say belonged to insurgent group Boko Haram, after the Chadians destroyed it during battle in Gambaru, Feb. 26, 2015.REUTERS

Cassandra Vinograd