As of April 5th 2014:
Global estimated number of Xbox One consoles sold at launch stands at 4,199,749.
2,686,482 of these units were sold in the USA
1,015,647 of these were sold in Europe
Remaining 497,620 sold outside USA and Europe
I calculate this to approximately 57% USA, 30% Europe and 13% oustide USA and Europe.
The Xbox 360 has sold 81.13 million units wordwide since its release.
Breaking down the sales of this I came up with 56% USA, 32% Europe and 12% rest of the world.