I stumbled across
this list of high-ABV percentage American microbrewed beers. Judging by the "country of origin" column in the table, these are NOT all American beers (although many of them are). After reading and re-reading, I think the guy is saying these are all beers you can easily PURCHASE in the U.S.
Also, his graphic is not a photo of the beers he's listing - it's just a photo of a bunch of beers from everywhere.
Finally, I guess I wasn't aware of Founder's Brewing Company (Kentucky Breakfast Stout), so I looked it up thinking I was discovering another Kentucky microbrewery - only to find they are located in Grand Rapids, MI :/