Two decades ago, then-President George W. Bush announced the start of combat operations in Iraq. The bloody occupation that followed lasted longer and cost more in lives and money than anyone guessed. (Image credit: Chris Hondros/Getty Images)

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What were the reasons given for the Iraq war, and how do they stand up today?

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In the 20 years since the United States invaded Iraq, Iran has built up loyal militias inside Iraq, gained deep political influence in the country and reaped economic benefits. For Washington, these were unintended consequences.

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