It seems in Europe if you order lemonade, they will bring you a sprite or 7up... most likely sprite. Europeans just don't have nearly the choice Americans have when it comes to pop.
I don't know about Europe, but here in Oz, there are apparently some tyrannical rules on caffeine content in soda, such that it's essentially banned in all sodas except colas. You can find Mountain Dew here, but it's actually caffeine free, so it's not nearly as popular as in the US. This of course leads to there being less selection among sodas than there would otherwise be.
(Of course, this is somewhat circumvented by the fact that some of the caffeinated drinks are simply marketed as "energy drinks" rather than "soft drinks".)
Those same rules apply in Canada, or at least they used to. It seems weird thinking Mountain Dew has caffeine in it, but then again who the hell drinks Mountain Dew?
For me it seems weird thinking about Mountain Dew without caffeine, but then I grew up in the US, where that's what it's known for.
I've yet to hear the explanation for *why* Australia and Canada have these rules. If caffeine is legal in general, why ban it in soda, and why then make an exception for colas? It makes no sense. Unless the thinking is just that soda is marketed to children, yet cola should somehow get a pass because it was grandfathered in? But if caffeine in cola is allowed, then this seems a rather ineffective method for reducing caffeine consumption by kids.
EDIT: As an aside, there's a great store in Sydney called "Sugar Fix", which carries numerous junk food imports, including Dr. Pepper and root beer. I don't remember what brand of root beer it is though. I think maybe A&W.