WORLD WAR I
World War I (also known as the Great War) was a global war originating in Europe that lasted from 28 July 1914 to 11 November 1918. The war drew in all the world's great powers assembled in two opposing alliances: the Allies (based on the Triple Entente of the Russian Empire, the French Third Republic, and the United Kingdom of Great Britain and Ireland) versus the Central Powers of Germany and Austria-Hungary. Although Italy was a member of the Triple Alliance alongside Germany and Austria-Hungary, it did not join the Central Powers, as Austria-Hungary had taken the offensive against the terms of the alliance. These alliances were reorganised and expanded as more nations entered the war: Italy, Japan and the United States joined the Allies, while the Ottoman Empire and Bulgaria joined the Central Powers. WWI was one of the deadliest conflicts in history, and paved the way for major political changes, including revolutions in many of the nations involved and to the Second World War twenty-one years later.