The conflict often called "The Great War" is World War I, which occurred from 1914 to 1918. Triggered by various factors including nationalism, militarism, and imperialism, it involved many of the world’s great powers divided into two main alliances: the Allies and the Central Powers. The war began after the assassination of Archduke Franz Ferdinand of Austria-Hungary. It saw unprecedented levels of warfare, including trench warfare, and resulted in millions of military and civilian deaths. The Treaty of Versailles, which formally ended the war in 1919, imposed significant reparations and territorial losses on Germany, sowing the seeds for future conflicts.