The invasion of Iraq, particularly, gave a big shot in the arm to the jihadi extremists.
The deceit and distortion surrounding the American invasion of Vietnam is by now so familiar that it has lost its power to shock.
Withdrawal of American troops must be a unilateral act, as the invasion of Vietnam by the American government was a unilateral act in the first place.
Iran has little capacity to deploy force. Its strategic doctrines are defensive, designed to deter invasion long enough for diplomacy to set it.
The invasion of Iraq was simply a war crime. Straight-out war crime.