[Quoth]

Maybe 13% is all of North America,
Anyway, if it's really only 4% Wikipedia needs to be less USA Centric and the USA needs to stop bullying the world over Copyright, Patents, biofuel (causes hunger) and excessive consumption.
USA Libraries should pay a per loan small royalty.
Radio & TV in USA should pay the Performance rights royalty as well as creators.
Web sites should stop using the inane USA mm-dd-yy or mm-dd-yyyy
USA cups in recipes posted on the Internet.
USA fluid measure shouldn't be on the Internet as it's USA only too.
Default Letter size rather than ISO A4 on most things shipped.
Default USA keyboard.

Sorry for the rant. But it's annoying a tiny minority behaving as if the USA way is the only way and sometimes as if the best way.
NTSC 525 B&W TV was better than UK 405 line TV. UK stupidly wasted millions restarting 405 in 1946 (turned off in Sept 1939) instead of USA TV format or European 625 by waiting 2 years till 1948.
The UK is pretty irritating at the moment too.