I did this about two weeks ago and I can vaguely remember the answer. My three most similar were all from the southern California which is where I live with one of it being Long Beach. The three least similar are all in the easy coast.
People from outside North America probably think you`re from the States, but over here we wouldn't make such a mistake."
Which American accent do you have?
You`re not Northern, Southern, or Western, you`re just plain -American-. Your national identity is more important than your local identity, because you don`t really have a local identity. You might be from the region in that map, which is defined by this kind of accent, but you could easily not be. Or maybe you just moved around a lot growing up.