Champagne is a carbonated, or sparkling, wine and is the same thing regardless of the country of origin. Although different brands of champagne taste different due to variances in the type of grape and manufacturing process, there is nothing that makes French champagne particularly special, unique or deserving of different treatment or protection from the champagne manufactured in other countries.
Have you ever popped open a fresh bottle of French champagne, taken a swig and thought, "Wow, this tastes like it came from the best French Vineyards!" Of course you haven't, because fermented grapes tastes like fermented grapes no matter what country it was grown in. I'll be fine with my Brut.