The United States leads a coalition to invade Iraq in March 2003, aiming to overthrow Saddam Hussein's regime and eliminate suspected weapons of mass destruction.
The Iraq War officially begins with the invasion by U.S.-led coalition forces.
Coalition forces capture Baghdad, effectively toppling Saddam Hussein's government.
Concerns and debates arise regarding the accuracy of the intelligence used to justify the invasion, particularly about weapons of mass destruction (WMD).
An increasing insurgency against coalition forces begins, fueled by various factors including political decisions and sectarian tensions.