who is the narrator in esperanza rising?

The narrator in Esperanza Rising is just a third-person narrator. However, the narrator tells the events of the story from Esperanza's point of view.

*Edit: Esperanza is not the narrator, because the word "I" is not used in the narration. However, the narrator tells us Esperanza's thoughts and follows Esperanza's behavior, thus the narrator is a third-person limited narrator (as opposed to an omniscient narrator, who knows the thoughts/behavior of at least two characters).

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