Very interesting. Could you cite a book/article where you got that from? I like collecting strange factoids like that.It is interesting that Americans with all their German blood are generally taller than many European races but feet size wise they tend to be narrower. Any self respecting Pom, Aussie, Kiwi or Yarpie has at least an E (USA) fitting in width aka UK "F" (Loakles, Churchs) or "E" (C&J etc) whereas your average Yank is a D which is a narow fitting to us antipodeans and Anglo-Celts.
I also have issues with vintage shoes not fitting my swim-fin-shaped feet.