The countries supposedly giving our corrupt trade negotiators kickbacks and taking our mfg jobs are losing them just as fast or faster than we are. Because the world is changing, and jobs once performed manually are increasingly being done via technology.

Your first paragraph is simple politics, nothing more. There are no stats to cite about jobs moving offshore due to any of those reasons you state specifically. What can't be denied is that standards of living are atrociously low in many of the these countries "taking our jobs" (China, Brazil, and India included for far too many), so workers work for a fraction of the cost of American workers. The impact of everything else you stated is marginal compared with simple - and extreme - differences in hourly wages.

But these jobs are not going to their final destinations when they "go abroad". That's just a stop along the way to mechanizing them.

The US has a huge advantage over these countries in that we have a skilled workforce that can improve and modify skills as needed. Far more capable of that than developing economies - if we'll let that happen and stop simply spouting political platitudes on the subject.