The reason is that publishers offer publication rights on a per-market basis.
And Amazon does mention it. Go back to the product description, scroll down to the section about books and prices, and it says 'For non-U.S. customers, content availability and pricing will vary. Check your country.' If you click on 'check your country' and select Canada, you'll see that 460,000 books are available. And they also explain why.
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