Saw all of the former factories -- that once employed people -- that are now warehouses for imported stuff, or "loft" apartments, or abandoned, or turned into offices for the goofy sorts of service businesses that people try to make a go of, film editing, printing, odds-and-ends stuff (God only knows what sorts of vices).
The moral of the story is that Unionized America cannot compete with Slave-labor China (and its slave-labor nations).
Aside from that, technology and automation have changed manufacturing forever. We can't go back to the days when we needed thousands of workers in a factory. We also can't be 1930's-era isolationists. If we don't give something in return, we can't expect to compete in newly opened foreign markets. Example: Hyundai and Nissan both have factories operating in the U.S. and providing jobs. Do we tell them to take a hike?