" there is negro problem. There is no southern problem. There is no northern problem" is an example of what rhetorical device

Epistrophe

Explanation:

A rhetorical device is a literary device that is used to persuade or pass across a meaning.

Epistrophe is a kind of rhetorical device that occurs when there is a repetition of the same words at the end of phrases, clauses or sentences that come after each other. This is usually done either for rhetorical or poetic effects.

The statement below is a example of an epistrophe.

" there is negro problem. There is no southern problem. There is no northern problem"

The word "problem" as can be seen is repeated at the end of the three sentences.

The use of epistrophe above makes the line memorable, gives rhythm and cadence and makes the sentences dramatic.