What sorts of links get upvoted more by Europeans than by Americans?

What sorts of links get upvoted more by Americans than by Europeans?

What proportion of the total links submitted / that make it to the front page are these?

Look, you've persuaded me that it's theoretically possible, but you've not demonstrated that it's actually happening. You appear to think that this phenomenon would be bad for HN, but you've not demonstrated that, either.