One big problem the United States has with overthrowing countries in the Middle East is that their populations will fight to the end to protect their civilization, whereas Americans will give up immediately if our Flamin' Hot Doritos™ go up in price by 10 percent.
That's a problem with imperialism any more, period. The Vietnamese proved it and the Ukrainians are giving a refresher course. If you never give up, eventually your attacker will go home.