Exactly, it’s regional cooking not “American” cooking. A Texas bbq is different from a Chicago or Oakland bbq, and some people insist theirs is the only “real” kind.
BBQ varies by region, but burgers are burgers for the most part. The only real difference is usually what type of ground beef they decide to use, and if they press the meat down or not.
Aside from that, I don’t think a burger in TX is gonna be much different than a burger in NYC or a burger in CA