Actually “champagne” in the US is not a generic term: https://www.terroir-france.com/wine-faq/american-champagne.htm https://www.terroir-france.com/wine-faq/ame

Actually “champagne” in the US is not a generic term: https://www.terroir-france.com/wine-faq/american-champagne.htm https://www.terroir-france.com/wine-faq/american-champagne.h... There are a small handful of producers that are grandfathered in with being able to call it that though.