
(This February 4 story deletes incorrect description of Boko Haram as an affiliate of Al Qaeda in paragraph 14; corrects number of Islamic State affiliates in West and Central Africa in paragraph 15; relationship between Islamic State West Africa Province and Islamic State in the Greater Sahara in paragraph 17; and the name of Islamic State's Central Africa branch in paragraph 21)
Since the peak of its power seven years ago, when it ruled millions of people in the Middle East and struck fear across the world with deadly bombings and shootings, Islamic State has slipped back into the shadows.