How did technological advancements change manufacturing methods during the Industrial Revolution?

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 were some of the new consumer appliances that americans could purchase in the 1920s

What was the most explosive issue facing the united states prior to the start of the civil war?