English, Welsh, Scottish - *and* British...? I'd just have British for the lot of them rather than clutter things up any further. Similarly, having Prussia *and* Germany is silly.
I don't suppose it matters much at this stage, but there are a few historical oddities in your descriptions, which I'm going to nitpick! France didn't begin as a collection of Norman kingdoms - it was already around before the Normans turned up. Kievan Rus turned into Ukraine rather than Russia - Russia as we know it came more from Novgorod and Moscow, although it was culturally greatly influenced by Kiev, of course. I believe that Voodoo has more to do with Benin than with Congo. I wouldn't call North Korea "fascist" - it's communist. Also, less-known fact: when Ethiopia is mentioned in the Bible, it's probably generally Nubia that is meant. Not that any Ethiopian will admit it, of course!
Well, very ambitious. It should be interesting to see how this develops!