I see that there is a new economic theory starting up. Probably dovetailing Trump's philosophy. It states that international trade is bad for a country like America. Jobs in manufacturing particularly it states, are eroded away by foreign competition. This is a complete reversal of current theory for the past 50 years.
Should Trump get elected, will he be able to put tariffs onto foreign imports ? Or will Congress block that path ? This will severely hit countries like China that export. Protectionism has been tried before but without much success. But if the foreign competition is winning hands down in almost every field then it may be the only course left as investment flees the country.