What caused civil war to break out in Iraq and what part did ISIS play in the crisis?
PLS HELP ASAP

A major reason for the prevalence of civil wars is that they have been hard to end. ... The civil war in Iraq began in 2004 as a primarily urban guerrilla struggle by Sunni insurgent groups hoping to drive out the United States and to regain the power held by Sunnis under Saddam Hussein.

in early 2017, ISIL controlled approximately 45,377 square kilometers (17,520 square miles) of territory in Iraq and Syria and 7,323 km2 of territory elsewhere, for a total of 52,700 square kilometres (20,300 sq mi).

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