Most academics will have studied and worked in many countries by the time they achieve something major. Nobody's the product of a single country like that. These people have been educated and worked in Canada, the US, the UK, Switzerland...
Sure, but then you would want to read about "Canada, the US, the UK, Switzerland..." and would be asking why these countries and not for example Belgium or Japan.
Any way you attribute this has some problems, as does trying to condense it to one country. Still just because something is not perfect does not mean it is not useful.
For example, France and Germany have very different systems and culture and you see that reflected in Nobel prizes and Fields medals. At that point you can then discuss which differences are "good" or "bad" by which metric.
But why?