Don't quite know where to put this, so I'll post it here - essentially none of the jobs created since the recession were available to people with just a high school diploma. Almost all of them went to people with at least an associate's degree or certificate, and a huge majority (75% or so) went to people with a bachelor's degree or higher.
http://money.cnn.com/2016/06/30/news/economy/college-grads-jobs/index.html
There are a lot of possible takeaways from this. One of them is that the narrative of "immigrants are taking all the low skilled jobs" may be somewhat misguided, in that there simply are no low skilled jobs being created. The American economy has almost completely transitioned away from low skilled jobs, they just don't exist - and yet 35% of our workforce does not have the qualifications necessary to get the jobs that are being created.
https://en.wikipedia.org/wiki/Educational_attainment_in_the_United_States
This is not going to end well.