The First World War was a big war that happened between 1914 and 1918. It was a global conflict involving many of the world's major powers, organized into two opposing alliances: the Allies and the Central Powers. The war began on July 28, 1914, when Archduke Franz Ferdinand of Austria was assassinated by a member of a terrorist group. This event led to a chain reaction of countries declaring war on one another. The war was fought mainly in Europe, but it also spread to Africa and Asia. ...