Amazon Book Reviews Worldwide?

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I never liked it how Amazon splits the world up into single countries, not as a book purchaser, nor as a reviewer. Many times I was asked by authors from other countries to post a review on their “national” Amazon page too. I did them the favor, yes, but I was not happy about the extra time effort. Why on earth is Amazon doing this? It’s the world wide web after all! Why not linking automatically to all nations where this particular book is sold? Some books might have hundreds of reviews o...