First US withdrawal from Iraq (2011)
In December 2011, the final US troops left Iraq under a status-of-forces agreement. The US left behind a government fractured along sectarian lines and an army trained by American advisers.
Within three years, ISIS seized Mosul and much of northern Iraq as the Iraqi army collapsed.
US forces redeployed in 2014, launching the coalition campaign that defeated ISIS's territorial caliphate by 2019.
The 2011 exit did not end US involvement in Iraq; it delayed a return. The 2026 exit faces the same risk.
