Me define these words (look at picture to see the words)

How did the new working class of the industrial revolution differ from the working classes of the earlier, farm based economy?

Which source would best a historian understand the effect of the great chicago fire on families? a. a biography of a chicago family displaced by the fire b. a letter from a grandmother in new york to her family in chicago c. a newspaper editorial about families who were displaced d. an oral history dictated by an adolescent who fled the fire

Diarys letters and memoirs are good examples of what