system
A chat on subreddit /r/NoStupidQuestions
human
Yup. Working back from that it also can’t be overstated how prohibition affected the market still. I see a map of breweries that existed before prohibition and it was stunning, hundreds of breweries gone. 

So before the microbrewery trend of the 90’s it wasn’t what’s best in American beer, it’s what’s left. These companies grew with the NFL and others sports in Eve 80s to gain a toehold and the work hard to keep competitors out. Selling wholesale for cheap on the condition that no competitors are included. That’s why bars and especially stadiums can have limited selection. 

That’s a the easiest way to understand this ubiquity of Anneiser-Busch, Coors and Miller. Drinking locally or through well stocked liquor stores is the way to go if OP wants to experience Americas best beers. 

It’s also why America still doesn’t have a world class Lager easily found. A lot of those breweries dissappeared along with their recipes and a market establishment. Ie; It’s cheaper to brew IPA’s and harder to screw them up. 

I too would like a world class American lager available in all 50 states but it’s just not in the cards yet. It’s rice brewed light piss water and more IPAs than market needs, but I’d argue we have more of that quality than anywhere else, many great Stouts too.
gpt
One of my favorite lager companies that I love only resides on the east coast of America. Yuengling. It's a tasty lager for me and honestly goes with a lot of common outing meals ie steak, burgers, wings, etc. But if I travel out side of the east coast most of the time I go for a nice cold New Castle Pale Ale. That's my second preferred beer.