The Svalbard Treaty, signed by members of the League of Nations in Paris, recognises the sovereignty of Norway over the Arctic archipelago of Svalbard (at this time called Spitzbergen), while giving the other signatories economic rights in the islands. February 10 – General Józef Haller first performs Poland's Wedding to the Sea, a symbolic celebration of the restitution of Polish access to the Baltic Sea. February 12–24 – Conference of London: Leaders of the United Kingdom, France and Italy meet to discuss the partitioning of the Ottoman Empire. February 13 – Switzerland joins the League of Nations. February 14 – The League of Women Voters is founded in Chicago. February 17 – A woman named Anna Anderson tries to commit suicide in Berlin and is taken to a mental hospital where she claims she is Grand Duchess Anastasia of Russia. February 20 – 1920 Gori earthquake: An earthquake hits Gori in the Democratic Republic of Georgia, killing 114. February 21 – The island province of Marinduque in the Philippines archipelago is founded. February 22 – In Emeryville, California, the first dog racing track to employ an imitation rabbit opens. February 24 – Adolf Hitler presents his National Socialist Program in Munich to the German Workers' Party (Deutsche Arbeiterpartei), which renames itself as the Nazi Party (Nationalsozialistische Deutsche Arbeiterpartei). March March 1 Hungarian Admiral and statesman Miklós Horthy becomes the Regent of Hungary. The United States Railroad Administration returns control of American railroads to its constituent railroad companies. March 7 – The Syrian National Congress proclaims Syria independent, with Faisal I of Iraq as king. March 10 – The world's first peaceful establishment of a social democratic government takes place in Sweden as Hjalmar Branting takes over as Prime Minister when Nils Edén leaves office. March 13–17 – Wolfgang Kapp and Walther von Lüttwitz's Kapp Putsch (an attempted coup in Germany) briefly ousts the Weimar Republic government from Berlin, but fails due to public resistance and a general strike. March 15 – The Ruhr Red Army, a communist army 60,000 men strong, is formed in Germany. March 15–16 – Constantinople is occupied by British Empire forces, acting for the Allied Powers against the Turkish National Movement. Retrospectively, the Grand National Assembly of Turkey regards this as the dissolution of the Ottoman regime in Istanbul. March 18 – Greece begins using the Gregorian calendar. March 19 – The United States Senate refuses