The Islamic State in Iraq (aka The Islamic State in the Levant, ISIS, ISIL) is a terrorist group in the Middle East.
ISIS Was Spawned By The U.S. Invasion of Iraq. ISIS was able to gain a foothold in Iraq because the U.S. invasion of Iraq deposed Saddam Hussein without a plan to deal with the aftermath of the invasion.
ISIS Leadership Comes From Saddam Hussein Military Bush Let Loose. After the Bush administration disbanded the Iraqi Army without a clear plan for what to do with those men, many of them became the Iraqi resistance to the U.S. occupation and later members and leaders in ISIS.