There is a notion of General or Standard American English [1]. Similarly, in Britain there’s Received Pronunciation [2].

Of course these are a social construct, but it’s not unfair to characterize that:

“General American English or General American (abbreviated GA or GenAm) is the umbrella accent of American English spoken by a majority of Americans and widely perceived, among Americans, as lacking any distinctly regional, ethnic, or socioeconomic characteristics.”

[1] https://en.wikipedia.org/wiki/General_American_English [2] https://en.wikipedia.org/wiki/Received_Pronunciation