I think part of your conclusion that the US is more beautiful is because you were in the other countries for a few days 'catching the highlights' and spent 4 months travelling around the US, giving you a totally different, far more immersive experience. More time to explore, more time to really get a feel for a place and what it has to offer. And (i assume) more time to actually feel something in relation to those places. I think the lesson here is that your experience is better when you travel slower, not necessarily that the US is objectively more beautiful than some other stunning places in the world. (Of course the US is beautiful. And so are those other places :-))
I think part of your conclusion that the US is more beautiful is because you were in the other countries for a few days 'catching the highlights' and spent 4 months travelling around the US, giving you a totally different, far more immersive experience. More time to explore, more time to really get a feel for a place and what it has to offer. And (i assume) more time to actually feel something in relation to those places. I think the lesson here is that your experience is better when you travel slower, not necessarily that the US is objectively more beautiful than some other stunning places in the world. (Of course the US is beautiful. And so are those other places :-))