The US - Mexico border is most porous and violated border in the world. Everyday, 100s and 1000s of people cross it. Mostly on foot, into the deserts of Arizona or Texas, going without food and water for days. Sadly, many dead bodies are found everyday.
Its amazing how US has mistreated its neighbored to the South when you compare the America's Northern neighbor Canada being just as rich as US. US should have invested in Mexico, still a third world country, long ago. Now many US corporations have relocated to Mexico only to save costs. I know its a complex equation of balancing costs while utilizing highly skilled educated work force, but there are ways to achieve that target, US had all the resources to help build universities and other educational institutions in US, but it did, only due to the fact that majority of Mexican are Non White. US is most racist, Pro White country in the world. Not much different the hitler's Germany. Look at what happened to New Orleans, a mostly black city, the president only went to N.O a week after the Katrina hurricane disaster, usually he heads to White areas that are hit with any disaster within a day, if not hours.