This attractive and edifying map-based interactive from the American Battle Monuments Commission will serve as a support to educators teaching the First World War, and to anyone with an interest in how the war began, how it developed, and how it finally ended. The history is divided into seven periods, including The Pre-War Period, each year from 1914 to 1918, and the Post-War Years. Clicking on any of these will redraw the World War I Timeline, detailing important events, campaigns, and the ebb and flow of the Allied and Central Powers. For instance, within the Prewar Years, selecting The Triple Alliance navigates to a portrait of Otto von Bismarck and a short explanation of the shaky alliance that was formed between Germany, Austria-Hungary, and Italy in 1882 to fend off France. Short video clips accompany many of the Timeline items, bringing the history of the war to life.