Why did civil war break out between different ethnic and religious groups in Iraq

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. idk if this is answer to ur question if it is not im sorry

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