The U.S.  currently has a higher output of manufactured goods that at any time since World War 2 but it is doing this with far fewer workers. There have been far more jobs lost to automation than exported abroad. If Trump offers tax breaks to induce companies to bring back foreign jobs, companies will just use this for further automation as is currently happening with Carrier in Indiana.  So where will the extra jobs come from? Even burger flipping will soon be one by robots.