In a 2016 offensive to take Mosul back from ISIS, the U.S. and Iran fought on the same side without ever publicly acknowledging it. The

In 2014, when most U.S. ground forces were gone and Iraqi forces were too weak, the threat of ISIS in Iraq spawned the PMF, a

During the rule of Saddam Hussein, few Iranians dared to make the religious pilgrimage to the holy city of Karbala in Iraq. But the toppling