The “winning hearts and minds” nation building exercise was a huge failure. Far too expensive in blood and treasure for what was achieved. The decision to disband Sadamn’s military, rather than use them for security should also be re-examined.
Bush was trapped and should have seen that before he invaded. The proper course would have been a zoned military occupation under a military government. No rights, elections, etc. and a military court system with plenty of swift justice executions. You need to cow a conquered people, not coddle them. If you don’t break their will to fight, you get more fight.