In this excerpt from President Kennedy of the 1963 Rights Address, he emphasizes his point most by using anaphora to emphasize the lack of equality.
Anaphora is a literary and rhetorical device that consists of the repetition of a word or phrase at the beginning of sentences or clauses. It is used to underscore the importance of certain ideas and to inspire, encourage or motivate the audience. Because of the repetition it is likely to be remembered long since. In this example the President repeats "It ought to be possible", as a way of saying that equality has to be a civil right for all Americans.