Iraq 2011 U.S. Withdrawal and ISIS Rise
Obama withdrew all U.S. troops from Iraq in 2011, declaring the mission accomplished. Iraqi security forces, without American support, crumbled under sectarian pressure. Al-Qaeda in Iraq—barely alive in 2011—rebranded as ISIS, exploited Syria's civil war, then stormed back into Iraq. By June 2014, ISIS controlled Mosul and declared a caliphate spanning Iraq and Syria.
ISIS seized territory the size of Britain, holding it until 2017-2019.
The U.S. returned in 2014 with Operation Inherent Resolve, a mission still running 11 years later.
The withdrawal-resurgence pattern haunts Syria policy: pull out too soon and ISIS returns stronger, as CENTCOM's two-year regeneration warning suggests.
