Where does JFK use Symbolism in his speech? (Provide and example)

JFK used a metaphor that compared a bond to mass misery which helped him explain to his audience that being bonded is like being in misery.  

Explanation:

 This eventually helped him stir up the emotions of his audience(he used pathos) which persuaded his american audience to agree with the president's agenda/intentions for America.

explanation:

cause they can

i think economic depression and disrupted trade and commerce