Hate to be the one to break it to you but that's how it already is in most of the US. All schools have a flag on a large erect pole out front, and an alarming number have a pseudo militaristic approach to raising and lowering it. The national anthem is like the Lords prayer was for us when we were being indoctrinated as kids, and said flag is pledged allegiance to and said anthem sung with great regularity and passion at all sorts of events from peewee non contact tiddly winks onwards.there has been widespread censorship in school libraries and curriculums in the red states for decades.
Most Americans believe the US is the greatest at everything (democracy, quality of life, other things) because that's what they are told all their lives. Most Americans have never been anywhere else (except Canada, which they see as the same but with cheaper groceries, and Mexico, bless it) because why would they leave the greatest place on earth?