ISIS, formerly known as Al-Qaeda in Iraq, had an uptick in activity in 2006.
But by 2008, after the Bush surge, Al-Qaeda was largely defeated in Iraq.
Via the Institute for the Study of War.
But then Barack Obama withdrew all troops from Iraq.
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Since Barack Obama pulled US troops from Iraq the death toll has reached 2007-2008 levels erasing all the gains from the enormously successful Bush surge.
Civilian deaths in Iraq are back up to 2007 levels. (Iraq Body Count)
It took George W. Bush five years to bring democracy to Iraq – It took Obama five years to bring in ISIS.