Aproduction possibility curve deals with which of these concepts

It deals with opportunity costs. Opportunity costs are not real costs, but rather the things that you had to give up in order to obtain something else. What you didn't obtain is considered to be an opportunity cost. A production possibility curve deals with this.

He wouldn't like it because he supported isolationism, which is when a country (the united states, in this case) didn't interfere or take part in other foreign affairs