I don’t need a game that’s set in a fictional future and world to be ‘authentically American’.
Well, the author of the Cyberpunk universe is Mike Pondsmith, who’s American and the game setting is in the US.
So be authentic to the universe. Be authentic to the lore. Nobody knows what ‘authentically American’ will look like in fifty plus years. And it’s still a fictitious city. There is no need for details to conform with any particular city of today, American or not.