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The Iraq War began with the US-led invasion on March 20, 2003, and continued through occupation, insurgency, and years of violence. The United States completed its military withdrawal in December 2011, but that date marks the withdrawal—not the end of all violence in Iraq. The war’s stated prewar rationale, post-invasion findings, human toll, and consequences remain subjects of debate.
What happened in the Iraq War?
The invasion toppled Saddam Hussein’s government in 2003, but the conflict did not end with the fall of Baghdad. The United States and its coalition partners then faced the challenges of occupation, rebuilding, and growing insecurity. An insurgency expanded, and sectarian violence reached a crisis point in 2006.
The George W. Bush Presidential Library describes the US-led war as running from 2003 to 2011. The Iraq Inquiry, a UK inquiry into British decisions and involvement, says the coalition removed a brutal regime but failed to achieve its goals for a new Iraq amid disorder, division, and insecurity.
Why did the US-led coalition invade Iraq?
The coalition’s stated case emphasized Iraq’s record of noncompliance with United Nations resolutions, concerns about weapons of mass destruction (WMD), and the asserted threat posed by Saddam Hussein’s government. The UK Iraq Inquiry describes Britain’s objective as disarming Iraq under Security Council obligations, while the US administration pursued regime change.
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UN Security Council Resolution 1441, passed on November 8, 2002, gave Iraq a “final opportunity” to comply with disarmament requirements and enabled renewed inspections. US Secretary of State Colin Powell presented the US case about Iraqi weapons and programs to the Security Council on February 5, 2003. Inspectors reported that cooperation was improving, though still imperfect. Opposition from France, Germany, and Russia blocked a second resolution explicitly authorizing force.
The Iraq Inquiry’s 2016 Executive Summary concluded: “In the Inquiry’s view, the diplomatic options had not at that stage been exhausted. Military action was therefore not a last resort.” This is the UK Inquiry’s finding about decisions and diplomacy; it is not a court judgment on the international legality of the war.
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- Author: Filkins, Dexter.
- Publisher: Vintage
- Pages: 368
- Publication Date: 2009
- Edition: Illustrated
Were there weapons of mass destruction in Iraq?
The George W. Bush Presidential Library says post-invasion findings did not establish the claimed WMD stockpiles and that US allegations had relied on unreliable or misinterpreted intelligence. The Iraq Inquiry also identifies prewar intelligence assessments as a central controversy. This finding about the claimed stockpiles does not mean Iraq had never possessed chemical weapons or weapons programs at earlier points in its history.
Key events and milestones
| Date | Milestone |
|---|---|
| November 8, 2002 | UN Security Council Resolution 1441 gave Iraq a final opportunity to comply with disarmament requirements. |
| February 5, 2003 | Colin Powell presented the US case about Iraqi weapons and programs to the UN Security Council. |
| March 20, 2003 | The US-led invasion began. |
| April 9, 2003 | Saddam Hussein’s government was toppled and Baghdad came under US control. |
| May 1, 2003 | President George W. Bush announced the end of major combat operations; the Bush Library notes the armed conflict was far from over. |
| June 2004 | Governing authority was transferred from the Coalition Provisional Authority. The UK Inquiry identifies Britain as a joint occupying power through June 28. |
| 2006–2007 | Sectarian violence reached a crisis point in 2006; in 2007 the US announced a troop increase of more than 20,000. |
| December 18, 2011 | The United States completed the withdrawal of its military forces from Iraq. |
Why did violence continue after the invasion?
The invasion was militarily rapid, but occupation planning was weak. A US Army historical study discusses assumptions that Iraqi military resistance would be limited and that US forces would not need to lead the post-hostilities phase. The study says the latter assumption proved wildly optimistic, and examines inadequate preparation for protracted insurgency and lawlessness, troop shortages, looting, and the power vacuum after the regime’s collapse.
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These are the study authors’ historical analysis, not a single-cause explanation of the war’s trajectory. Iraqi political actors and other conditions also shaped what followed. Saddam Hussein was captured in December 2003 and executed in December 2006, according to the Bush Library overview; neither event ended the conflict.
How many people died in the Iraq War?
The George W. Bush Presidential Library gives approximate figures of a little over 4,400 Americans and nearly 100,000 Iraqis killed. These are not definitive totals: the Library’s short overview does not document its counting method, the time cutoff for each population, or whether all categories of direct and indirect deaths are included. The Defense Casualty Analysis System provides US military casualty data, but does not settle the full Iraqi civilian and combatant death toll.
When did the Iraq War end?
There is no single date that captures every meaning of “end.” Major combat operations were declared over in May 2003, the occupation authority transferred governing power in 2004, and the United States completed its military withdrawal in December 2011. The withdrawal is a useful endpoint for the US-led war framing, but it does not mean violence in Iraq ended then.
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When did the Iraq War start?
The US-led invasion began on March 20, 2003.
Did post-invasion findings establish the WMD stockpiles cited before the war?
No. The George W. Bush Presidential Library says the claimed stockpiles were not found and describes the allegations as based on unreliable or misinterpreted intelligence.
Did the Iraq Inquiry rule on whether the war was legal?
No. The UK Iraq Inquiry examined UK involvement and decisions. It concluded that diplomatic options had not been exhausted and military action was not a last resort; that is not a court ruling on international legality.
Did all violence in Iraq end when US forces withdrew?
No. December 2011 marks the completion of the US military withdrawal, not the end of all violence in Iraq.
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