When is the last time the U.S had a just war?

The curse that went on with administrations after the Gulf War was that the American teams always picked a partisan leader to rule over Iraq. The war was good because it liberated Kuwait from Saddam Hussein, who sacked Kuwait and started threatening Saudi Arabia. It would have threatened the US monetary system if Iraq controlled Saudi Arabia's northern oil fields. I think that was a just war, and was well planned. 

The war after that took Saddam away from ruling Iraq. I think that was a good and just war because Saddam wanted us to think he had weapons of mass destruction, i.e. chemical weapons that he used on the Kurds. The engineer of the weapons was named Chemical Ali. The weapons were never found, and possibly didn't exist, but we nailed the army he had left over from the former war. We got rid of a tyrant, but the Bush administration and the Obama administration could not get a good leader to lead them.  I think we should have appointed a military leader like what we did in Japan until we could make better choices.