Pax Europaea

On 28 July 1914, Archduke Franz Ferdinand of Austria, the heir to the throne, is fatally shot by Gavrilo Princip. Princip, an ethnic Serb, was a member of the nationalist-Yugoslav organization known as Young Bosnian. With Serbia blamed for the murder of the Archduke, Austria-Hungary would invade the tiny Balkan nation. Russia, backing Serbia, declares war on Austria. Germany, backing Austria, declares war on Russia and France backs Russia by declaring war on France. This conflict evolved into the First World War. What would the world look like if Russia never backed Serbia?