Can a defeated ISIS keep its brand alive?

In less than three years, the Islamic State extended its so-called Caliphate in Syria and Iraq to cover some eight million people. Now, Kurdish and Arab militias, advised by US Special Forces, are wrapping up the remains of Raqqa. The city is now in ruins, no longer the capital of the Islamic State that drew thousands of militants to the Middle East. But students of ISIS say almost 40 so-called "provinces" still exist in other parts of the world, including Southeast Asia -- and Africa. That may explain the ambush deaths of four American soldiers in Niger, and the Trump Administration wants to weaponize drones to kill ISIS recruiters. In the meantime, almost 6000 fighters have returned to their home countries. Will they help a deadly ideology to survive?