How does Johnson's use of rhetorical devices contribute to the purpose of the speech?

The Rhetorical devices used by President Johnson in his speech are

Alliteration: It refers to the repetition of initial consonant letters or sound. For example: "I speak tonight for the dignity of man and the destiny of democracy"

Antithesis: It refers two contradicting ideas are next to each other. For example : "There is no cause for self satisfaction in the long denial of equal rights for millions of Americans. But there is cause for hope and for faith in our democracy in what is happening here tonight."

Hyperbole:A hyperbole means to talk in excess about a person, thing, or idea. Johnson uses this rhetorical device when speaking about segregation says, "It is to deny America and to dishonor the dead who gave their lives for American Freedom."

Metaphor:A metaphor refers to the comparison of two things without using words. Johnson uses this when saying, "In Buffalo as well as in Birmingham, in Philadelphia as well as Selma". This is a metaphor because he is comparing the racist environment of northern cities to that of southern cities Paradox:A paradox is a contradiction that has a bit of truth. Johnson used this rhetorical devise when he says "Extend the rights of citizenship to every citizen of this land." This is a paradox because African Americans were citizens but were not at the exact same time Rhetorical questions:A Rhetorical Question is a question that needs no answer. Johnson asked a Rhetorical Question in his speech when he said, "What is a man profited, if he shall gain the whole world, and lose his own soul?" Parrallelism: Parallelism is said to be used when a speaker will use the same sentence structure in two sentences are placed side by side. Johnson used this rhetorical device in his speech when he said, "So it was at Lexington and Concord. So it was a century ago at Appomattox. So it was last week at Selma, Alabama"