Before a single shot was fired at Sarajevo, four forces had been building toward catastrophe for decades. This free activity drops students into the debate historians still have: which one — Militarism, Alliances, Imperialism, or Nationalism — made World War I inevitable? In this activity, students vote on which MAIN cause — Militarism, Alliances, Imperialism, or Nationalism — did the most to make World War I inevitable, then justify their thinking and respond to their classmates' reasoning. Sim