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Most of the places I've lived, litter isn't much of an issue. There's certainly more than I'd like, but you've got to go looking for it other than around overflowing public trash cans and such. Vegetation near highways has a pretty high carrying capacity for litter, too.

I've visited places where it's much worse. And have heard it used to be very commonly a lot worse throughout the US. But anti-littering campaigns with slogans such as Don't Mess With Texas and Litter and It Will Hurt and penalties seem to have had at least reasonable success.