Despite the USA being the the birthplace of jazz (and continuing to produce jazz musicians) Europe has long been an important source of income for jazz musicians of all nationalities.
Maybe even more important for American than European musicians.
As a "not famous" jazz musician, I myself (an American) was pleasantly surprised how much easier it was for myself to get decent paying gigs while living in Europe than the USA.
Here's a rather old article from the Ny times regarding this situation.
I think you will find the situation very similar today as 1996: