Yes, compared to rich world countries (which only a small fraction of the world live in), the USA could be considered sub-par.
Actually, the US economically outperforms among them too. Systematically, the US is still the best country to live in.
People's insistent avoidance of georgia makes parsing things difficult at times, but stateside economic performance means basically shit for ground side conditions. Especially if much of it isn't effecting the lives and lifestyles of parts of the population.
Incidentally, great honking swathes of american economic gains have done roughly fuck and all for giant chunks of the american population. Things probably are better in a number of ways than the 70s, 80s, 90s, or earlier, but it can be real damn hard to see much of that coming from rising economic performance. Lot of that crap is pretty disconnected from much of anything except a balance sheet.
...
also, apropos of something, I actually have known a few people over the course of my life in this area that lived in falling apart buildings (i.e. a shack) that, ferex, had dirt floors, that worked 12+ hour days (if not, that I can recall, in the fields, as that doesn't really need many people to do in most places in the US) and, if not technically lacking (i.e. they weren't going barefoot, but the things were in bad enough shape they might as well have been) shoes for
themselves, couldn't afford them for their children. Both great grandmother (now deceased), grandmother, and mother, have all dropped some of their own money a few times to try to get shoes (and other things) for some of the local kids that were particularly bad off. Welcome to rural poverty, folks. I'm actually in one of the nicer shitholes in the country, too.
Also roomed with a fellow that had night terrors due in part to seeing a friend of theirs gang raped to the point said friend died from it afterwards, as a cop just kinda' watched. Let's just say there's some pretty damn shit urban areas, too