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https://en.wikipedia.org/wiki/Iraq_War
The Iraq War was a protracted armed conflict that began with the 2003 invasion of Iraq by a United States-led coalition. The invasion regime toppled the government of Saddam Hussein. However, the conflict continued for much of the next decade as an insurgency emerged to oppose the occupying forces and the post-invasion Iraqi government. An estimated 151,000 to 600,000 or more Iraqis were killed in the first 3–4 years of conflict. The United States officially withdrew from the country in 2011 but became re-involved in 2014 at the head of a new coalition; the insurgency and many dimensions of the civil armed conflict continue.