If you guys are curious about the percentage of WW sales the US encompass for both consoles, here are the calculations:
PS4 US sales (assuming that Windows Central numbers are true) = 15.93 million
PS4 WW sales = 50 million
PS4 US % = 31.86%
XBO US sales as of the end of 2015 = 11.12 million
XBO WW sales as of the end of 2015 = 19.1 million (based on EA's PS4 + XBO estimates)
XBO US % as of the end of 2015 = 58.22%
US numbers are based on this image Aquamarine provided and numbers from the archives.