Invading with our dollars. Who knows?
Maybe if we had stayed out of WWII, Nixon would have gone to whatever of the two empires ruled Europe and most of Asia, and opened free trade. Assuming that empire had somehow decided to leave the Western Hemisphere alone after digesting the Eastern one.
I don't understand your header. The only way we can be defeated in Iraq, and Afghanistan, is to give up. Our military has not lost a direct military battle yet. We are being drained by booby-traps, snipers, and most of all, hostile domestic politics.
And yes, if we leave Iraq, we will flee from Afghanistan soon after. Guaranteed.