The principles that underly the actual USA, specifically the constitution (as written, not as "interpreted"), are the foremost in the world by quite a distance -- they do the best job of balancing individual rights without falling overboard and choking off individual freedoms. Not perfect (oh, would I love to rewrite some of it), but still the best to date. Comparable efforts make serious mistakes, particularly in the areas of suppressing speech and giving cover to superstition. The ideal here in the USA was a profoundly well thought out constitutional republic, given the time frame the ideas were laid out in.
However, those principles are now only a vague memory in the actual day to day operation of the US legal and social systems. So while one might admire the foundation, the intent, and even the attempts of many individuals within the context of what one could simply call 'The USA", it's a huge mistake to take those high points as a legitimate description of who and what we are today: A corporate oligarchy, wildly out of the citizen's control, engaged in wholesale deception to keep it that way. Today, we have embraced some of the most repulsive things we used to say we stood against. From torture to surveillance to pervasive, systemized political corruption to massive, for-profit imprisonment, the USA at this time is no more than a caricature of its founding ideals.
Speaking to the younger generation (yeah, I'm getting old, and this is my lawn), I'm sorry, very sorry in fact, but you're well and truly fucked.