It was in the vacuum of the deteriorating Syria conflict that a little-known and terrifically violent branch of al-Qaeda grew into the foremost terror group on the planet.
In 2014, the Islamic State group completed its takeover of the eastern Syria city of Raqqa and went on to conquer Iraq’s Mosul. It eventually took over an area straddling the countries’ border the size of Britain — absorbing weapons, wealth, and personnel along the way. The expansion went largely un...
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