After the civil war as carpet baggers moved south to fill teaching jobs, White southerners pulled their kids from school. To this day Mississippi and Alabama have not recovered from a lack of education. The Arabs had most of the worlds knowledge, and we use Arabic numbers and algebra to this day, but their religion killed education setting Arab nations back some 500 years by the end of WWII.
What Trump is creating, is a generation of uneducated Mexican criminals who will be more dangerous than the last. From these kids will come a Mexican leader who will hate the US.