| Disclaimer: I'm French I never understood why the "Champagne" issue was so obviously silly to Americans. Champagne is an actual place, that's where the name of the wine made there comes from. Could you name something "Napa Valley wine" if it's not from Napa Valley? |
A randomly selected hamburger, frankfurter, or wiener, probably isn't made in Hamburg, Frankfurt, or Vienna.
And sometimes it can get even weirder: Stilton cheese is named after where it was historically sold, but it's made elsewhere and you're not allowed to call a cheese "stilton" if you actually make it in Stilton. (Edit: I originally got Stilton and Cheddar mixed up).
As I'm a British national, I don't know if this is the full reason, or if this is in combination with the natural human tendency to care more about nearby things and that the Atlantic is so big that all of the USA is closer to one of the places called "Champagne" within the USA than to the original in France.