The conference opened on January 18, 1919. This date was symbolic, the anniversary of the proclamation of William I to the German emperor in 1871 in the hall of mirrors of the Palace of Versailles, just before the end of the siege of Paris. This date was also important in Germany as the anniversary of the founding of the Kingdom of Prussia in 1701. Delegates from 27 nations were assigned to 52 commissions, which held 1,646 meetings, to prepare reports, with the help of many experts, on topics ranging from prisoners of war to submarine cables, international aviation, to war responsibility. The main recommendations were folded in the Treaty of Versailler with Germany, which had 15 chapters and 440 clauses as well as contracts for the other defeated nations. In addition to territorial conflicts, the League has also attempted to intervene in other conflicts between and within nations. Among his successes was the fight against the international trade in opium and sexual slavery and his work to alleviate the plight of refugees, especially in Turkey until 1926. One of its new features in the latter area was the introduction of the Nansen Passport in 1922, the first internationally recognized identity card for stateless refugees. When World War I broke out in August 1914, Italy declared its neutrality. Although the Kingdom of Italy was nominally associated with the German Empire and the Austria-Hungary Empire within the Tripartite Alliance, it did not join the central powers; Indeed, Germany and Austria-Hungary had gone on the offensive, while the tripartite alliance was to be a defence alliance. In addition, the tripartite alliance recognized that Italy and Austria-Hungary were both interested in the Balkans and in consulting each other before changing the status quo and compensating all the advantages of the region: Austria-Hungary consulted Germany, but not Italy, before giving Serbia the ultimatum, and refusing to compensate them before the end of the war. Italy was negotiating a better agreement with the Allies, particularly with regard to the accession to the territory of the Austro-Hungarian Empire. However, Russia had its own pro-Slavic interest in the region and complicated negotiations.
Russia`s negotiating position has been significantly weakened by its heavy military losses. London and Paris insisted and Russia renounced in April 1915 most of Serbia`s demands and accepted the conditions of Italy`s entry into the war, which would limit Russia`s strategic presence in the post-war Adriatic.   Italy accepted the offer of the Allies, in which Italy would receive, after the defeat of Austria-Hungary, a piece of Austria and a piece of desosmanic empire. This was formalized by the Treaty of London.