Not sure if the anti-Trumpers here are aware but there are currently 65 borders walls/fences around the world, with a new one just announced last week in Norway on their russian border. This is hardly a new phenomenon.
Along with the wall/fence, the US should eliminate the 14th amendment mis-reading/anchor baby incentive, all welfare/free healthcare/housing/schooling for illegals, and arrest with massive fines any employers found hiring illegals. Would stir the economic pot for a bit, but like all such situations would calm down eventually and wages would finally start to rise again after about 50 years of illegal alien-driven stagnation.
About your first paragraph, I don't know anything about it. I agree wholeheartedly with your second paragraph though. Cheap imported labor makes OUR wages stagnate.
And it harms blacks the most, it's pathetic