Not surprising. Microsoft is very methodically making most of their stock available in the US, their best market. It's a great plan to become the clear market leader in the biggest gaming region, and then just get as many units as they can get in the other regions, over time.
This gets their foot in the door and ensures they get solid representation among third parties. As an Xbox One owner, I couldn't be happier that their strategy is working out for them.
It hasn't worked, yet, though. Sony is still leading. And really, MS has no other option, at the moment. Even with plenty of stock for the One, and limited stock for the PS4, in the regions they are both in, Sony is trouncing them everywhere but the US. Even if Xbox pulls ahead (we'll have to see how January goes to see normal sales out of holiday periods), they will probably only lead there by 1.2:1 when all is said and done. That's not what I would call a clear market leader.
Lol, at first I thought this was a thread by another user who was trolling you. You got +1 respect from me for making this thread and eating the crow.