What was the name of the union strategy to control the mississippi river and split the confederacy?

Which factor has played the most important role in changing the way history is studied over time?

What has been a long term effect on the panama canal

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