Because there are CDMA carriers on both Mexico and Canada. The USA is not the only country that uses CDMA.
That's new. Maybe it'll speed up the retiring of CDMA here in the US.Were CDMA carriers, not are.
Telus and Bell starting to shutdown its CDMA networks on January 31st | MobileSyrup
If CDMA was still relevant outside the United States then the S7 and prior would be using the Snapdragon up here.