What were the sides in the Iraq war?

The Iraq War primarily involved two main sides: the coalition forces, led by the United States and including the United Kingdom and several other allied nations, and the Iraqi government under President Saddam Hussein. The conflict began in March 2003 when the coalition launched an invasion, citing the need to eliminate weapons of mass destruction and combat terrorism. Following the initial invasion, the war transitioned into a prolonged insurgency involving various Iraqi groups, including Sunni and Shia militias, against coalition forces and the newly established Iraqi government.