That war was won by using Gen. Sherman's strategy of "total war" to break the will of the people to fight. This strategy resulted in an unconditional surrender of Germany and Japan, and it's the main strategy our military is trained to execute.
Of course, it would be insane and immoral to use "Uncle Billy's" strategy of total war in Iraq, because that nation has never threatened us in any way, and it would make President Bush seem like an out-of-control madman.
Instead, President Bush is using our military as social workers with guns who are functionally a peacekeeping force in the middle of Iraq's civil war. President Bush has faith the Iraqis will miraculously become more like us and be our friend in the wider war against Islamic terrorism. Reality shows that his unnecessary invasion of Iraq has become a cause for Islamic religious-nationalism to proliferate and to more easily take advantage of our exposed and vulnerable military in the middle of Arabia.
Bush seems to be our own worst enemy, because his strategy is allowing the jihadists to humiliate us on the world's stage for all to see. The enemy wants us to continue Bush's strategy, because they have the advantage. If total war cannot be used in Iraq, then we must retreat, change our tactics and fight on our terms.