The Spanish Influenza Epidemic in Titusville, 1918-19

One epidemic in the early 1900s killed more people than the entirety of World War I. In fact, this epidemic killed more people in the United States than the Civil War (620,000) or all other U.S. wars combined (644,000). What was this deadly and destructive force that wiped out millions the world over? A simple three-letter affliction that still kills people today: the flu.