Many years ago I had a young assistant who went to Paris for a Summer. She was a classically beautiful Jewish girl whom one would think looked perfectly at-home in any Continental city.
She said that all she had to do was walk down the street, and everyone KNEW she was an American.
I’ve been in very rural areas of the US where people knew immediately that I wasn’t ‘from there’. Sometimes, you don’t even have to speak.
Show up in Boston during a blinding snowstorm in a western overcoat, cowboy boots, and a winter cowboy hat...they have a tendency to look at you funny and know you “ain’t from here” - LOL!
Not to mention the looks you get when you say, “Good mornin’” to everyone you pass on the street.