Wolverine is Canadian, the whole Alpha Flight team actually is Candien. A bunch of he New Mutants are from all over including Brazil and Ireland. then there was the British X team. Most are American, of course most of the books are for American audiences.
Of course the comic books are mostly for Americans. How are you going to sell a book anywhere else that features truth, justice and the American way?
All these other ersatz superheroes are nothing more than attempts to ape Batman, Superman, etc,,, Point me to a foreign superhero that existed in the 1940s. “Me too’s” for the ‘60s are clearly guilt inspired ,,,”oh yeah,, we probably need a superhero too” things.