Porter is studying the influenza pandemic of World War I. He is examining letters, journal entries, autobiographies, and newspaper articles from that time to see how fear of the disease affected the daily life of millions of people throughout Europe during that era. Which statement describes the type of history Porter is writing?

What makes fort sill historically unique among other regional military installations? a. it is the site where seven major commanders of us military efforts were trained. b. it houses the largest explosive weapons factory in the united states. c. it specializes in training soldiers to preserve the cultural artifacts of nations invaded by the us military. d. it is the oldest functioning installation in oklahoma.