teaches a class about the 1916 bombing of a parade in san francisco. that killed ten and wounded 40. the bombing took place in what was called preparedness day organized by probusiness groups to keep people vigilant in the case the united states entered world war i. the attack remains the worst act of terrorism in san francisco history. this is about 50 minutes. >>> well, good morning thanks for coming. i appreciate you all being here on a drizzly day at providence college. today i wanted to share with you i think a story and a moment in american history that is one of the, for me, more important moments of the late 19th and early 20th century. holds a lot of significance in the period of the guilded age and the progressive era. it also happens to be a the subject of my new book. i have been living and breathing in this period and in this moment.