Their ideas about what’s “reasonable” and “traditional” about trade, and how the US should be treated by other nations (that they should be dependent on keeping us happy), come from the 1950’s.

A time when most of the world was rubble and/or construction sites, and we were the only industrialized nation on the planet. When they really were dependent on our goodwill.

Trumpers and Brexiters have trouble with the concept of “that was then and this is now.”