Yes over coming the sheer brutal power the united states could bring bear with their armed forces, not even mentioning allies or nukes, would be formidable indeed. I like a scenario of disenfranchised allies like the commonwealth, rearming and a massive covert troop build up in Canada, striking down thru the rockies and sweeping across the heart land, and into the grain belt seizing the food stocks of the nation. Then the ginourmaous consumer centres of the major urban conurbations along the great lakes and east and west coasts would become burdens to the still loyal american forces and force them independently to the negotiation table. Then using captured media centres, and public personalities, try exploiting inter racial fault lines in broader communities, (divide and conquer) As for fighting resistance movements ala red dawn, you have to try and take away there motivation(what makes them fight), ie, act as you are only seizing super rich/disliked peoples and organisations assets and actually releasing them to the public, ie: liberating them from the scourge of the globalisation financiers and slavery of the money market boom and bust cycles, high unemployment ,an uncaring washington etc.
Put in motion massive public works on infrastructure, and after the initial combatant stage flood the market with cheap american made consumerables. As further proof that this is not in-fact an invasion merely an effort to make America great again. Only after years of lulling the community into a sense of security, do you unleash the death squads upon the descendants of the traitors to the crown hiding within the community. In mid-night raids. Of course all this is done assuming that nukes arn't released and us armed forces are over come by a miraculous new allied super weapon. That enables them to reclaim the skies and oceans. And over whelm there land based forces.