"Some of those jobs of the past just aren't going to come back. "
Well, that's a true statement.
Some jobs aren't coming back.
Americans are heading more and more into service type jobs, which are higher paying.
Most of the US trade deficit is stuff we can by cheaper from outside while we spend our time making more money by providing services.
And any effort to make more things here will make those things more expensive to American consumers.
And to make our domestic agricultural industries more profitable, we need more immigrant workers who are will to work for less.
The low unemployment today means that here is an ever higher demand for workers at low wages or to import products, since low unemployment allows people to move up in pay.
With unemployment so low, who are they going to get to work these new manufacturing and mining jobs if they become available?
America at this point does not have a jobs problem.
But there still is an income inequality problem that these policies are not going to resolve.
The tax cuts widened that income gap, in fact.