The war was won.
i.e. the conventional Iraqi military forces where destroyed. This happened in about 3 weeks.
The peace has not been won.
Just because there are violent neo-Nazis still about, it doesn't mean that ww2 has not been won.
Just because there is civil unrest and non-conventional attacks in Iraq, it doesn't mean that the war wasn't won.
"War" is a thing that can be won with bombs.
What we have in Iraq is violent civil unrest, no ammount of bombs can "win" civil unrest.
Civil unrest, however can be far worse than war, and much harder to deal with.
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