Earlier quoted context omitted.
I'm surprised he chose Mexico as an example as well, but because of the issues it has with corruption, emigration, and violence. Even a middle-class country with those problems seems like a bad example of progress.
Does Mexico still have an emmigration problem? I know that for the last few years, the USA has had net-negative immigration from Mexico, as people are moving back.
Relevant: http://www.nytimes.com/2013/09/24/us/immigrant-population-sh...
That article reports that immigration from Mexico may be on the rise again. It also cites that half of the undocumented immigrants in the U.S. (about 6 million people) were born in Mexico.
I guess my point is that Mexico has significant issues to deal with and therefore it may not be a good anecdote and instead be a better candidate for the special-considerations bucket.