I think ProfCrash is right. If you sell at Amazon.Com, you are free to specify which countries the book will be available in. But that doesn't mean that, if you put Spain in that list, that the book will automatically appear in Amazon in Spain. It only means that people in Spain will be able to purchase it from the US.
Your best bet would be to maintain accounts in both countries (and any other country where Amazon has a presence where you think there is a market for your products). That will give the book the greates exposure.
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