You seem to be under the impression that defining Champagne as coming from Champagne is a recent thing. It's not, it's been like that since the 19th century, ev

You seem to be under the impression that defining Champagne as coming from Champagne is a recent thing. It's not, it's been like that since the 19th century, even being codified in the Madrid treaty of 1891 - long before anyone was making sparkling wine in the USA . The fact that the US didn't initially sign these treaties and allowed people to sell fake Champagne to their consumers for so long doesn't really change that