This year (2014) marks the 100th anniversary of the beginning of World War I. This lesson, which is aligned to the Common Core State Standards, examines the causes of WWI. The main article provides information on events leading up to the war and includes discussion and writing questions. Additional activities available are: The Bosnian Crisis of 1908; Did the Serbian Government meet the Austrian Demands?; What Country Was to Blame for WWI?; and two enrichment activities on cartoons and music.