Bush-43 should have asked his dad why he left Saddam in power at the end of the first Gulf War, when he could have easily hung him from a street light in Baghdad.
A trillion or two spent, 4500 military deaths and 100,000 or more injured, hundreds of thousands of Iraqi dead, and what we accomplished in the long run is strengthening Iranian hegemony in the region. Iraq was a country created by drawing lines on a map after WW 1, composed of factions that traditional hate and slaughter each other, and the only thing that kept it together was Saddam's iron fist. It didn't take a rocket scientist to figure out what we happen once we were gone, after we hanged the bastard.