How does the author create ethos or personal credibility in city upon a hill by JFK

He creates credibility by connecting to his audience by talking about how no matter where he goes, Massachusetts has always been and will always be his home.

Explanation:

The author was said to creates personal credibility by connecting to his audience as well as his readers and by talking about how no matter where he goes, Massachusetts has always been and will always be his home.

He also creates personal credibility by saying he is more than fit to lead in which he talk about the sixty day period that he constructed administration, in which he says based on that he will be an acceptable leader making him to have great reputation as an american citizen.