As World War I completes 100 years ,World powers are still trying to avert the world war THREE. The Great War pulled in close to 70 million soldiers on five continents, leaving some 10 million dead in battle The 1914-18 conflict toppled four empires, Austro-Hungarian, German, Ottoman and Russian, redrawing the world map and shaping the geopolitics of the coming century.1914 June 28: Archduke Franz-Ferdinand, heir to the Austro-Hungarian throne, is assassinated by a pro-Serb nationalist in Sarajevo. July 28: Austria-Hungary declares war on Serbia. Russia mobilises two days later in aid of its Serbian ally, setting off a chain reaction among European powers bound by a web of military alliances.