Which two groups comprised the insurgency in Iraq that developed after the overthrow of Saddam Hussein?

Question

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The insurgency in Iraq after the overthrow of Saddam Hussein consisted of two main groups: Hussein loyalists who wanted to regain power and control in Iraq, and non-Iraqi Islamist fighters who saw an opportunity to establish a foothold in the country. These two groups formed a loose coalition that carried out attacks against coalition forces, Iraqi security forces, and civilians.

Which Two Groups Comprised the Insurgency in Iraq That Developed