Who was JFK’s audience? To whom was he trying to appeal? Why?

If you're referencing his inaurgual speech then he is addressing both his supporters and those who voted against him. He won by very few votes so he made a non-partisan speech. He appealed to the nationalism of American freedom. This appeal went to all Americans to show he was fit to serve all the countries President. His speech mostly focused on foreign affairs to stay neutral and supportive of American freedom.

The orgin

hope this helps