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Iraqi combatant dead (invasion period): 7,600–45,000[67][68] Insurgents (post-Saddam) Killed: 26,544+ killed by Coalition and ISF forces (2003–11), excludes inter-insurgent fighting and noncombat losses[f] (4,000 foreign fighters killed by Sep. 2006, all causes)[73] Detainees: 60,000 (US and Iraqi-held, peak in 2007)[11] 12,000 (Iraqi-held, in 2010 only)[74] 119,752 insurgents arrested (2003–2007),[75] of this about 1/3 were imprisoned for longer than four years[11]
Total dead: 34,144+–71,544+ Total captured: 120,000+
Documented deaths from violence: Iraq Body Count (2003 – 14 December 2011): 103,160–113,728 civilian deaths recorded[76] and 12,438 new deaths added from the Iraq War Logs[77] Associated Press(March 2003 – April 2009): 110,600 Iraqi deaths in total[78]
Statistical estimates Lancet survey** (March 2003 – July 2006): 654,965 (95% CI: 392,979–942,636)[79][80] Iraq Family Health Survey*** (March 2003 – July 2006): 151,000 (95% CI: 104,000–223,000)[81] Opinion Research Business**: (March 2003 – August 2007): 1,033,000 (95% CI: 946,258–1,120,000)[82] PLOS Medicine Study**: (March 2003 – June 2011): 405,000 (60% violent) (95% CI: 48,000–751,000)[83]
* "injured, diseased, or other medical": required medical air transport. UK number includes "aeromed evacuations". **Total excess deaths include all additional deaths due to increased lawlessness, degraded infrastructure, poorer healthcare, etc. ***Violent deaths only – does not include excess deaths due to increased lawlessness, poorer healthcare, etc. ****Sukkariyeh, Syria was also affected (2008 Abu Kamal raid).
The Iraq invasion was part of the Bush administration's broader war on terror, launched in response to the September 11 attacks. In October 2002, the US Congress passed a resolution granting Bush the authority to use military force against Iraq. The war began on March 20, 2003, when the US, joined by the UK, Australia, and Poland, initiated a "shock and awe" bombing campaign. Following the bombings, coalition forces launched a ground invasion, defeating Iraqi forces and toppling the Ba'athist regime. Saddam Hussein was captured in 2003 and executed in 2006.
The fall of Saddam's regime created a power vacuum, which, along with the Coalition Provisional Authority's mismanagement, fueled a sectarian civil war between Iraq's Shia majority and Sunni minority, and contributed to a lengthy insurgency. In response, the US deployed an additional 170,000 troops during the 2007 troop surge, which helped stabilize parts of the country. In 2008, President Bush agreed to withdraw all US combat troops, a process completed in 2011 under President Barack Obama.
The primary justifications for the invasion centered around claims Iraq possessed weapons of mass destruction (WMDs) and that Saddam Hussein was supporting al-Qaeda. However, the 9/11 Commission concluded in 2004 that there was no credible evidence linking Saddam to al-Qaeda, and no WMD stockpiles were ever found in Iraq. These false claims faced widespread criticism, in the US and abroad. Kofi Annan, then Secretary-General of the United Nations, declared the invasion illegal under international law, as it violated the UN Charter. The 2016 Chilcot Report, a British inquiry, concluded the war was unnecessary, as peaceful alternatives had not been fully explored. In 2005, Iraq held multi-party elections, and Nouri al-Maliki became Prime Minister in 2006, a position he held until 2014. His government's policies alienated Iraq's Sunni minority, exacerbating sectarian tensions.
The war led to an estimated 150,000 to over a million deaths, including more than 100,000 civilians. Many deaths occurred during the insurgency and subsequent civil war. The conflict had lasting geopolitical effects, contributing to the emergence of the 2013–2017 War in Iraq, which caused over 155,000 deaths and displaced millions of Iraqis. The war severely damaged the US' international reputation, and Bush's popularity declined sharply. UK Prime Minister Tony Blair's support for the war diminished his standing, contributing to his resignation in 2007.
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