The occupation of Iraq (2003–2011) began on 20 March 2003, when the United States invaded with a military coalition to overthrow Iraqi president Saddam Hussein and his Arab Socialist Ba'ath Party, and continued until 18 December 2011, when the final batch of American troops left the country. While the United States, the United Kingdom, and Australia were the largest contributors to the coalition, 29 other countries, such as Japan, were involved in the Iraq War in a lesser capacity. Additionally, several private military contractors took part in enforcing the occupation.
It was a period of violence and political turmoil, and saw strong foreign influence exerted on Iraqi politics. In April 2003, the fall of Saddam's government was formally marked by the establishment of the Coalition Provisional Authority, which later appointed and granted limited powers to the Iraq Interim Governing Council. In June 2004, the Iraqi Interim Government was established, ending the international armed conflict that had existed between Iraq (that is, Ba'athist Iraq) and the United States. Following the January 2005 Iraqi parliamentary election, this administration was replaced by the Iraqi Transitional Government. A year later, the Al Maliki I Government took office.
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