—First, immigrants are pouring in from the banana republics of Central America not because Central America is (permanently) poor, but because Central America is (supposedly only temporarily) plagued by criminal violence.
—Second, there's no need to worry about the overall number of immigrants coming to America because net immigration from Mexico is negative, or at least it was the last anybody checked in roughly 2009–2012. That's because Mexico is finally (and permanently) not poor.
Yet Mexico, like Central America, has Sicario levels of crime, with the number of homicides hitting a new record last year. Further, crime in Mexico has been proliferating, from lucrative drug smuggling into the United States to chaotic domestic crimes like punching holes in oil pipelines and derailing trains.