[dip166]

I can understand your frustration as I've felt that myself. Guess as customers, we're used to see (and made to see in a sense for marketing purposes) Amazon as a single store, but it's really not. It's Amazon US, Amazon CA, Amazon UK, etc., all separated and attending different markets and, in case of books, different copyrights. Although they supposedly work as a brand and have this quality standards and whatnot.

A similar good example in my opinion would perhaps be McDonalds; I doubt you expect prices and even menus to be the same everywhere?

I'm living in Japan now and had to open a new account here which is not connected to the one in US. If I buy books from the US account, I cannot access them on my Japanese Kindle and vice-versa. Japan doesn't have Kindle for PC, so even if I install the English version, cannot access my Japanese account on it.
Recently, there was even a pathetic talk about being able to join Japanese and US accounts, but I never saw the advantage to the customer and even the customer sale guy couldn't explain it to me, so I never did.
Bottom line, you just have to create a new account on Amazon US, no big deal. Actually, I'm under the impression you just have to sign in?...