Which statement about railroad systems in the 19th and 20th centuries accurate? A) imperialists rejected the use of railroads in their colonies
B) european govt opposed the development of railroads
C)railroads helped promote the factory system and urbanization
D) railroads made transportation of goods less efficient

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