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The Islamic State has seen major setbacks this year, first in the defeat of the physical caliphate and then with the death of its founder and leader, Abu Bakr al-Baghdadi. But experts warn that the ISIS ideology remains strong and that a global resurgence is already underway. Photo: Reuters More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Visit the WSJ Video Center: https://wsj.com/video On Facebook: https://www.facebook.com/pg/wsj/videos/ On Twitter: https://twitter.com/WSJ On Snapchat: https://on.wsj.com/2ratjSM #WSJ
