What was what was the major accomplishment of the Mongols

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

What does the document of the birtish octopus is an uderlying cause of the world war 1

Look at the graph. where p is price and q is quantity, what might cause a move from b to a?