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While I understand the idea, it's not something that really makes sense.
If we split the US from the rest of the world, and the "World news" becomes over populated with let's say news from the UK, then people would want the UK split to it's own area. The process could go on and on for each dominant country in the World news category.
I'm with Snog and Bluezone777 on the matter. I feel that it would be a complete waste of time and effort for the staff to make new sections that would more than likely not get posted in as often as another section would.