The pledge of allegiance comes to mind, as it's nothing more than propagandistic indoctrination and it begins at such an early age. Dissenters are met with ostracization. Children are faced with the true ugliness of America from the moment they set foot into a classroom.

Basically, as soon as you're able to properly use all 5 of your senses and have some degree of autonomy, this country has already forced its way into your psyche as an entity that must be respected and submitted to at all costs. It's terrible.