It was only two years before , in 1785, that Benjamin Franklin had returned from his diplomatic post in France. This event (return of Franklin) occurred prior to the event that has just been described in the context of the narrative.
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Perfect StrangerCould someone enlighten me?The point of reference is 1787. The text that precedes the text you've quoted must have mentioned something about the events of 1787. Once that time period is established in the text, the author can say what happened earlier using the past perfect:
Perfect StrangerHmm... But if the time is indicated clearly, by the year 1785 and by the word before then why is there a need for past perfect tense?Strictly speaking, you don't really need the past perfect. Nevertheless, it is used to alert the reader that the narrative is not proceeding in chronological order.