NOTA. When either one threatens us here, we stop them here. Otherwise, we stay away.
"Conquest is easy, control is not."
-Kirk, "Mirror, Mirror"
Conquest are usual much harder than control. USA could easily have "controlled" Iraq and Afghanistan, even without increased brutality. It would just demand USA was willing to use the number soldiers which was needed for a occupation (a general rule are 1 soldier for every 20 people in the occupied country) and treated their government as what they were Quesling regimes which was in power because of American power, rather than pretend they had any legitimacy among the general civilian population, from there USA could have developed democratic institution and then allowed free elections.