(Click To Enlarge)From The Fogg Of War:
When the Coalition invaded Iraq, it didn't bring much in the way of troops. This much we know. When looting and mayhem broke out after the invasion, the Coalition was quite relieved to not have to worry about one part of Iraq--the Kurdish north. And worry about it they did not. The Kurds, a long-time ally of the US against the Hussein regime (and target of much US sympathy) were happy to salute the US and say "don't worry, no anti-US activity will happen here." And happen it did not.
So the over-taxed, frazzled, and exhausted coalition said, "thank goodness," and let the Kurdish Peshmerga police its own territory. In the meantime, the US started taking shots at Sunni Arabs that were causing trouble (and some that weren't). Not only did this occupy many Sunni forces, but it chewed them up. This will become important.
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My Comment: An excellent analysis on the Kurds in Iraq, and the differences between this community and the rest of Iraq.