1917 explores one of the most decisive and dramatic years of World War I, when the conflict changed direction and the old world began to fracture. From the Zimmermann Telegram and the entry of the United States into the war to the Russian Revolution, the collapse of the Eastern Front, the horror of Passchendaele, submarine warfare, morale crises, and the reshaping of the Middle East, this volume shows how 1917 transformed the war from a brutal military stalemate into a global struggle of nations, empires, ideologies, and exhausted societies.