The techniques of sparkling winemaking did not originate with the Benedictine monk Dom Pérignon, nor was the first purposely sparkling wine produced in the region of Champagne. Regardless, through centuries of refinement Champagne has become the world’s leading sparkling wine and the vinous embodiment of luxury and celebration.
No, blanc de blancs really only needs to be made from white grapes. We just state 100% Chardonnay, because 99% of the examples are 100% Chardonnay. In the same way we talk about the three grapes of Champagne, even though there are actually 7.