You don't. You pull a North Vietnam and never surrender to the occupation forces. Eventually the enemy cannot afford to sustain an occupation and withdraws. America has so many more guns than any other country on earth and people intelligent enough to use them well that an invasion force has NO CHANCE of success in the medium to long term. Never underestimate the amount of power and influence a small group of people with rifles and irregular warfare tactics can wield. Especially locals that know every square inch of their backyards by heart. Look no further than Ukraine for a recent example, which is somehow hanging on for over two years mostly with light arms, almost no training, while completely outgunned. America has geography strongly in its favor except Alaska. A successful adversary would need to fragment and manufacture American allegiances with divide and conquer tactics to succeed.

TV used to be the opiate of the masses. Now it's video games and social media.