Rel=Canonical Doesn’t Solve Internatio...

In what way does the rel=canonical tag solve any international SEO problems? I’m really confused on this one; some SEOs are suggesting that this tag in some way helps with duplicate content issues with same-language content, targeted at different countries. I have heard this at a conference too. The rel=canonical tag states which page, of any number, is the official source of the content. This is great for if there are URLs that sometime have parameters on the end of them, which can cause dupe content issues, or if you publish the same content across a number of domains...

useful page | useful page 2 | useful page 3 | useful page 4 | useful page 5 |