Answer:
"Of the people, by the people, for the people".
Explanation:
Parallelism is a literary form of grammar where one or more clauses or phrases are of the same structure, sound, meter or even meaning in their use. The use of this grammatical style gives the sense of similarity in the sentences.
The excerpt given in the question is from "The Gettysburg Address" by President Abraham Lincoln. The lines in this excerpt also contains an example of parallelism. This is seen in the last lines "Of the people, by the people, for the people" which have the same emotion and schema of things. The same structure and flow, the same rhythm etc all belongs in this phrase.
Thus, the phrase that contains parallelism is
"Of the people, by the people, for the people".
