One has to remember that America very few original beer styles it can call its own. (I'm referring to the official BJCP style guidelines) That being said, it can be concluded that American craft breweries are essentially making European style beer. Some of the few major differences are Europeans don't imperialize everything and don't age their beers in liquor barrels. Pretty much what I'm saying is America is on par with Europe because its brewing European style beers because everyone got tired of drinking piss in a can from places like BMC and Pabst. The only beer style America has going for it in terms of surpassing Europe is an American IPA and all its variants. Yes there are some brrweries like Rogue and Dogfish Head that fool around with odd types of beer but on the grand scale of things, America is only on par with Europe due to its quality reproduction (for the most part) of European style beers.