The Official October 2010 NPD Thread (Data in 2.5 hours covers Oct 4-30)

[Nintendogamer]

TheSource said:

Its at 43m in the USA - not North America. We have 49m in the Americas. DS is around 4m in Canada, and over 1m in Mexico among others.

Such a vast difference, NA = north america,  America's = NA. USA = America and not NA, bound to be confusing to some people.