The primary reason for the outbreak of civil war between different ethnic and religious groups in Iraq was the power vacuum created after the overthrow of Saddam Hussein's regime. The dissolution of the former Ba'athist regime led to a struggle for control over resources, political power, and regional influence between different sectarian groups. Additionally, historical tensions and grievances among various ethnic and religious groups, such as the Shia majority, Sunni minority, and Kurdish population, were intensified during this period. Political rivalries, economic disparities, and external influences further exacerbated these divisions, contributing to the eruption of violence and the ultimate breakdown of social order in Iraq.
