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What is the history of the United States' involvement in the war in Iraq?
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The United States has been involved in the conflict since 2003, when it invaded Iraq. Since then, the US has spent over $800 billion on reconstruction efforts and humanitarian aid to the country. In 2011, President Barack Obama announced that all troops would be withdrawn from Iraq by the end of that year. However, in 2014, the US re-entered the country with airstrikes against ISIL targets. The US still maintains a significant military presence in Iraq, including a number of bases and facilities.