“California Champagne”?
The famouse Champagne region of France produced the first sparkling wines. The Champagne wine region, is a historic province within the Champagne administrative province in the northeast of France. The area is best known for the production of the sparkling white wine that bears the region’s name. EU law and the laws of most countries reserve the term “Champagne” exclusively for wines that come from this region located about 100 miles (160 km) east of Paris. The U.S. failed to sign the 1930s labeling agreement limiting use of the word “champagne” to wines from the Champagne region of France, so some American wineries feel free to call their wines champagne.
Winetrivia -Fun with Food and Wine 