Cary Grant was never an "American" character.  He was British from womb to
tomb.  He spoke with an English accent.. albeit with a flair all his own.
Hepburn is distinctly New England, upper crust in most, if not all, of her
films.
Otherwise, I see your point.  Often when watching films of the thirties, it's
tough to distinguish the Yank from the Brit.
 
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