Minor Nit: Why on earth would the Ottomans jump in aginst Germany _and_ the U.K.?The World, c.1917. In the midst of the First World War. The POD is primarily Belgium's compliance with German troop movements, preceded by better Anglo-German relations.
The war was fought by the League of Berlin, consisting of Britain, Germany, Austria-Hungary, Sweden, Spain, Bulgaria, and Greece, against the Belgrade Pact, an alliance between France, Russia, Serbia, Turkey, Portugal, Japan, and Italy. Russia pulled out after the Revolution of 1916. America joined on the League's side near the end of the year shown.
HTG