> More importantly, most Americas do not text anyone outside of the country, and haven't really ever
As a dual-citizen of Canada and the US, I'd have to say that's massively overgeneralized. Pretty much every Canadian I know regularly texts with Americans (iMessage or not), which means those Americans are texting with people outside of the Country.
The USA and Canada are really the same country, as far as the telcos are concerned. They're part of the same North American phone system, and have the same +1 prefix. Calls between the countries are all free, and don't carry international charges. You might think they're separate countries, and the governments may agree, but the telecom companies disagree.
As a dual-citizen of Canada and the US, I'd have to say that's massively overgeneralized. Pretty much every Canadian I know regularly texts with Americans (iMessage or not), which means those Americans are texting with people outside of the Country.