What effect did the statewide primary system have on politics?

From 1990 to 2008, by what percent did the world’s most developed economies cut their greenhouse gas emissions?

Which was the cause of the rise of the persian empire?

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