There are many places an american can go. Unlike the USA, most countries don't tax your worldwide income. So, for instance, you could become a citizen of any of the EU countries that don't tax worldwide income, and earn your income outside that country tax free (and live outside it as well.)
I know of several countries within the EU where you can be a citizen and pay essentially no taxes, or extremely low taxes. These are very pleasant places as well. For instance, one location is the side of a very nice lake in switzerland (Campoin d' Italia) and Andorra has some nice tax advantages, and one of the best climates in Europe. Monaco is not bad, though expensive for my tastes, while Licthenstein, Austria, Switzerland, and all this british islands whose existence is for purposes of avoiding taxes aren't too bad either.
The idea that you can't have a high quality of life in China or India compared to the USA seems silly to me, but I haven't lived in either of those countries. There are many countries in Latin, South America, Asia and Europe where you can have as high a quality of life as the USA, or higher, and at much less cost than the USA.
I think the idea that anywhere desirable is worse than the USA is a kind of parochial perception. Of course ones preferences can vary, but, for instance, in many ways much of eastern europe is nicer than the USA, even though they are "poorer". There are many countries that are in many ways richer, or where you can have a better quality of life at the same or less cost.
I just think that people in every country believe that their country s superior to others, and can't imagine how anyone would want to live in another country... but they also haven't experienced those other countries.
I've visited a lot of countries, and have yet to visit one that was terrible, and about %50 of them are better than the USA in noticeable ways, and the ones that aren't as good, aren't as good in ways that aren't really all that bad.