I'm specifically talking about English vs. American spelling. I.e. words like flavour vs. flavor, colour vs. color etc. We already know that Nakamoto used English spelling in his personal communication, so unless you believe this was a deliberate setup, we can pretty much exclude all U.S. born citizens.
Edit: and I also believe the general consensus was that English was Nakamoto's native language.
So he could be Canadian as well is what you just said.