"More than two years later, many people still ask, "Why did the US invade Iraq?" Some people answer, "For oil." Others say, "To remove a dangerous dictator," or, "To liberate Iraqis," or, "To spread democracy." There are other possible answers as well: To project American power in the strategic and volatile Middle East. To spread democracy. To help Israel. The question lingers because the initial reasons that our government gave, that Iraq had WMD and planned to use them against the US, or that Iraq was allied with Al Qaeda, have been disproved.
Here's another answer to the question: We invaded Iraq to invade Iraq."
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http://www.counterpunch.org/foley09152005.html