Five years ago, ISIS reigned over 34,000 square miles in Iraq and Syria and collected billions of dollars in taxes and oil revenues as well as from looting banks. Today, its so-called caliphate is virtually gone. And yet on Sunday, Peter Bergen writes, the continued influence of ISIS’ ideology became gruesomely apparent: A terrorist attack, one of the most lethal since 9/11, killed at least 321 people at churches and luxury hotels in Sri Lanka.
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