It should be noted here the way the immigration "issue" became an issue in the first place. Criticism of the NAFTA agreement that sent our jobs south. Ross Perot running for president was against NAFTA while Bill Clinton and George Bush Sr were for it. Ross Perot said there would be a great "sucking sound" of jobs heading south. He was correct. The major auto manufacturers in particular moved their plants to Mexico where they could pay workers $9.00 a day for labor, not have to comply with OSHA or EPA standards anymore. Flint Michigan in particular was hit economically. The movie "Rodger and Me" by Micheal Moore highlights the issue. Of course the savings cost of making the autos was not passed on to the consumer nor did the quality of life of the average Mexican citizen improve. Today Detroit and it's outlying areas, once the powerhouse of the American Auto industry, is in a state of economic stagnation with abandoned houses and buildings. https://en.wikipedia.org/wiki/Decline_of_Detroit
( above a link to wiki article on Detroit's economic fall)
Many Americans, and people of other nations, were critical of the World Trade Organizations efforts to combine the entire worlds economy citing the problems with NAFTA. The World Trade Organization protests began in earnest in the 1990's.
A lot of political effort has been applied by globalists to circumvent and get rid of anti World Trade Organization criticism and distrust. The political monologue presented that "Mexicans are here to take your jobs" is simply to dislocate you from the truth - our jobs got sent to Mexico by NAFTA.
This monologue has been aided by the rise of the Zeta cartel in Northern Mexico. The Zeta cartel is much more violent than other cartels. Other cartels did not want to discourage US tourism into Mexico because that would not only hurt their drug business but the businesses in their communities, making them enemies of the local population and putting them at risk of being sold out to the authorities.
The Zeta cartel was started by a Mexican Colonel, who went to El Escuela De Los Americas in Panama, a military school run by the United States Army and CIA. The Colonel and his men were sent to Northern Mexico to defeat the cartels and instead, as the story goes, started their own cartel. They have been involved in mass murders and across the border violent crime.
above is a link to a wiki article on the Zetas.
This has helped fuel the anti Mexican sentiment in our nation to the benefit of the official monologue. Trump's wall is an expansion of this idea, a rallying point for the meek minded ( like Make America Great Again - as if it wasn't already great ). The whole issue is a manufactured slight of hand, a distraction away from the globalist agenda, and like a rumor has infected the minds of people to the point of fanaticism.
I will say this though, and that is breaking up global trade and economies is probably a futile effort at this point. We can try and put in some rules, but the fact of the matter is that our manufacturing jobs simply are not coming back no matter how much we try, for a multitude of reasons - and not just because of foreign outsourcing. The world is catching up with us from an economic standpoint. And that doesn’t necessarily have to be a bad thing either. We, as Americans can still do a lot to try and stay in the race though in our changing world, namely strengthening our middle class, education, infrastructure, switch to green tech, etc - all which we haven’t been doing a very good job of. We have the corporate rich, so we still have a head start - we just need to manage our path forward much more wisely.