Sweden -- along with virtually all European countries other than Switzerland, Norway and Luxembourg -- have much poorer middle classes than most US states.
https://www.aei.org/carpe-diem/if-sweden-left-the-eu-and-joi...
https://mises.org/wire/if-sweden-and-germany-became-us-state...
Switzerland, Iceland, Luxmbourg, Belgium, Ireland, France, UK, Spain, Austria, Italy, Malta, Norway.
If you go by mean wealth on the other hand, only Switzerland is higher than the US. But that is not a measure of middle class wealth.
Source: https://en.wikipedia.org/wiki/List_of_countries_by_wealth_pe...
Americans with savings rates that are comparable to Europeans end up accumulating tremendous wealth over their careers, even in the middle class. This is offset by the majority that spend every penny. That Americans don’t save their prodigious income is an unfortunate artifact of having multiple generations of nearly unbroken prosperity.