Except these days it seems the whole of Europe undervalues software engineering.
Also, most developers in America don't make that much more than European developers. It's just that we happen to be willing to pay seasoned developers quite a lot more. Most junior and mid-level developers here don't make much more than $90k, and many of the companies that are willing to pay at least that or more are located in areas where the cost of living makes that salary abysmal.
But the ceiling for top developers in most of the world is below that. Even here in the UK, where salaries are starting to get pushed up a bit, there are still only a few employers who would beat that today, and mostly in places like London where cost of living is also relatively high. Hardly anyone is making the kind of money that you see devs with as little as 5 YOE routinely making with half the companies in SV, even people with multiples of that experience who would be staff/principal level in a big US tech firm.