What kind of unions were formed in the late 19th century

How long ago was the fall of rome (in years)

Match each model with its name and the name of the scientist who created it.

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