This map illustrate the columbian exchange. which contribution to american agriculture was introduced from europe?
a. cattle
b. tomatoes
c. corn
d. pineapple

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