Where Islamic State Stumbles in Its War With Al-Qaeda

Its recent victories don't tell the whole story.

What's on the horizon for Islamic State?

Photographer: MARWAN IBRAHIM/AFP/Getty Images

Since al-Qaeda expelled it from its ranks a little more than two years ago, the Islamic State has been on a tear. It has taken Iraq's second-largest city, declared itself a caliphate, won over al Qaeda affiliates in Sinai and Nigeria, and conducted high-profile terror attacks in Europe and the Middle East.  

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