https://www.nationalreview.com/2019/10/immigration-enforcement-mexico-cooperating-with-us/
‘No one will come to trample our country, our land!’
One of the reasons border apprehensions have dropped from their alarming peak in May is that Mexico has been pretty aggressive in stopping third-country nationals from traversing its territory on their way north to make bogus asylum claims so they can be released into the U.S.
But why has Mexico been willing to work with us like this? It’s especially curious because in the past, Mexico was not at all eager to help us limit illegal immigration, a pattern we might have expected to intensify with last year’s election as president of left-wing populist Andres Manuel Lopez Obrador (commonly known as AMLO, pronounced as a word rather than initials).
No doubt President Trump’s tariff threats had some effect. Three-quarters of Mexico’s exports go to the U.S., and despite increased integration of our economies over the past couple of decades, they still need us a lot more than we need them. Also, Trump’s mercurial temperament clearly has the Mexicans worried that he could do something rash (similar to Iran’s fears about Reagan if the hostages weren’t released before he was inaugurated).
But it’s unlikely that these things would be enough to move a sometimes touchy nationalist like AMLO. Rather, I think a big part of the explanation is that the current flow of illegals is mainly made up of foreigners, not Mexicans. Earlier waves of mass infiltration across our southern border consisted mainly of Mexicans, and while Mexico quickly took back its people who had been nabbed by the Border Patrol, it did little if anything to reduce the flow. They did establish a police-like unit of the country’s immigration agency called Grupo Beta, which worked on Mexico’s northern border (opposite our southern border), but its remit was to help potential illegals with water and first aid and protect them from criminals.