What event triggered the start of world war i? a. the sinking of the lusitania b. the zimmerman note c. the assassination of archduke francis ferdinand d. the sinking of the maine

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