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The reality is that the United States is flailing as Iraq hovers between a low-grade civil war and the full-blown version. Most of today's violence is among rival religious sects; the insurgency linked to al-Qaeda terrorists, which ignited the sectarian violence, trails well behind.
That reality leads to a hard truth: The United States probably has one last shot at achieving minimal stability in a unified Iraq. Bush's rhetoric aside, that is the best outcome that can be reasonably hoped for at this point.
Accomplishing it means preventing an all-out civil war long enough that Iraq's fledgling government - which has been in office barely three months - has a decent chance of taking control, particularly of the proliferating sectarian militias. If that can't be done, it's hard to see a useful role for U.S. forces.
Certainly, it's difficult to know just when the line into full-scale civil war is crossed. Bosnia in the 1990s provides a useful yardstick. The point of no return there came when extremists managed to stir passions to the point at which neighbors felt they had no choice but to turn on their neighbors. That hasn't yet happened in Iraq, where polls show most Iraqis crave a normal life.
USA Today