[svachalek]

That comes largely from reduced cost of transportation (including taxes and tariffs), such that the cost of distant human production + transportation has fallen below the cost of local human production.

As production automation increases, fewer humans are required, and the cost of transportation becomes more important. Also, as the standard of living in these distant countries increases so does the cost of labor, further tilting the scale. So, we are seeing Mexico become a much bigger source of manufacturing for the U.S. recently.

As manufacturing continues to automate and costs decrease further, we may see manufacturing move back to the U.S. However for the same reason it won't be bringing any notable amount of jobs with it.

As for political solutions, in the U.S. at least, labor has quite simply lost. With a few exceptions such as the larger government employee unions there is no money and no bargaining power on the labor side and we can only expect the scales to keep tilting further in capital's favor. We'd need to see something that caused a really huge demand for local, unskilled labor in the next few years to have any chance of this happening before all labor is automated out of existence.