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My aunt has loaned me my maternal grandfather 's journal , which he wrote in as a soldier in World War II . My grandfather was of African American and Native American descent and so fought in a segregated unit . One of the first entries I found was written on D - Day .

Why would the narrator be so impressed with the journal ?

--It is from the first integrated military unit .
--It is from a historic period .
--It is from WW1 .
--It is from their grandmother .
It is from a historic period .