You'll love to read about the US and Canada. In the early days of PoW, it wasn't as strict. So a lot of weird shit happened. The US and Canada are a testimony to what PoW used to be. To put it short and bluntly, it was a clusterfuck. We ended up redoing the entire US canon so it made more sense. But to be honest, it's still fucking weird. But it's the best that can be done without completely wiping the canon (which we can't do cause there's too many things tied to it). 

The rest of the world isn't as bad. Even some of the weird things that happened back in the day can pass as being plausible.