This is the kind of sentiment I have when a question is asked on “do Japanese people talk like anime characters in real life?” And the straight answer is no. Is it the same with “do Americans talk like in Netflix” or is that a load of garbage? It happens with some people thinking anime speak is how Japanese people interact but in the end they appear stupid as no one talks like that IRL. Now, is the manner of speaking from US Dramas or TV representative of a real life conversation?
Not to mention the myriad actors using a US accent(s). FWIW, I can’t recall a movie/series that, when based in a region the actors know personally didn’t do the local accent wonderfully. But, that’s the rub: it’s such an enormous, overpopulated populated landmass that it’s bound to have innumerable dialects.
Although, perhaps what OP’s asking is which, if any, is/are considered the common/baseline dialect of US English? 🤷🏼♂️