Which factor most helped the North win the Civil War?

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

When did the us congress declare war on the confederate states?

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