It's simple, there wasn't enough stock to sell and more!
The reason to the UK and US are so much higher in comparison to everywhere else is that those were the 2 Xbox dominated countries, so Sony would have focused on them to try and win them from Microsoft
So the breakdown is 1.4m Americas (90% US) and 700k elsewhere (250k UK)
Xbox One is 800k US and 330k elsewhere after its first week. They clearly held back a decent stock in America, but I don't think they'll have sold enough to get to 2.1m. They might be level in the US, but behind elsewhere







