Apparently, the Joint Forces Commands' latest report lists Pakistan (not much of a surprise) and Mexico as the two most likely countries to experience sudden and rapid collapse.
"…Mexico’s mention beside Pakistan in a study by an organization as weighty as the Joint Forces Command (which controls almost all conventional forces based in the continental U.S.) speaks volumes about growing concern over what’s happening south of the U.S. border ….
"Vicious and widening violence pitting drug cartels against each other and against the Mexican state have left more than 8,000 Mexicans dead over the past two years. Kidnappings have become a routine part of Mexican daily life. Common crime is widespread. Pervasive corruption has hollowed out the state.What form such a response might take is anyone’s guess and the study does not spell it out, nor does it address the economic implications of its worst-case scenario. Mexico is the third biggest trade partner of the United States (after Canada and China) and its third-biggest supplier of oil (after Canada and Saudi Arabia) ….
"Closer to home, the U.S. economic crisis looks likely to slow down a $1.4 billion assistance program (military equipment, training, technology) to help the Mexican government gain the upper hand over the drug cartels and re-establish control over what some have called 'failed cities' along the border, places where shootouts, beheadings and kidnappings have become routine…."