While it is true that a lot of the illegal entrants coming in from Mexico are Mexicans, the majority actually come from many areas of the world.
"More non-Mexicans than Mexicans were apprehended at U.S. borders in fiscal year 2016 for the second time on record (the first was in fiscal 2014.) In fiscal 2016, 192,969 Mexicans were apprehended, a sharp drop from a peak of 1.6 million apprehensions in 2000. The decline in apprehensions reflects the decrease in the number of unauthorized Mexican immigrants coming to the U.S."
http://www.pewresearch.org/fact-tank/2017/03/02/what-we-know-about-illegal-immigration-from-mexico/

You guys just make stuff up to satisfy your personal biases.  Do a little more reading than talking.