Events January January 12 – Gopinath Saha shoots Ernest Day, whom he has mistaken for Sir Charles Tegart, the police commissioner of Calcutta, and is arrested soon after. January 20–30 – Kuomintang in China holds its first National Congress, initiating a policy of alliance with the Soviet Union and the Chinese Communist Party. January 21 – The Earl of Athlone is appointed Governor-General of the Union of South Africa, and High Commissioner for Southern Africa. January 22 – Ramsay MacDonald becomes the first Labour Prime Minister of the United Kingdom. January 25 – The first Winter Olympics, the 1924 Winter Olympics open in Chamonix, in the French Alps. January 26 – Petrograd (Saint Petersburg) is renamed Leningrad; it will revert to Saint Petersburg in 1991. February February 1 – The United Kingdom recognizes the Soviet Union. February 5 – GMT: A radio time signal is broadcast for the first time, from the Royal Greenwich Observatory. February 9 – Canada's National Hockey League expands to the United States for the first time with the inclusion of the Boston Bruins. February 12 – Rhapsody in Blue, by George Gershwin, is first performed in New York City, at Aeolian Hall. February 14 – The Computing-Tabulating-Recording Company (CTR), based in the U.S. state of New York, is renamed International Business Machines (IBM). February 22 Treaty of Rome: The Kingdom of Italy annexes the Free State of Fiume, and the Kingdom of Serbs, Croats and Slovenes absorbs Sušak. Calvin Coolidge becomes the first President of the United States to deliver a radio broadcast from the White House. March March 3 – The 407-year-old Islamic caliphate is abolished when Caliph Abdülmecid II of the Ottoman Caliphate is deposed. The last remnant of the old regime gives way to the reformed Turkey of President Kemal Atatürk. March 6 – İsmet İnönü forms a new government in Turkey (2nd government). March 15 – Horacio Vásquez wins the Dominican Republic general election, becoming president, coinciding with the end of United States military occupation. March 25 – The Second Hellenic Republic is proclaimed in Greece. March 29 – In France, the Third Ministry of Raymond Poincaré begins. April April 1 Adolf Hitler is sentenced to 5 years in jail in Germany for his participation in the 1923 Beer Hall Putsch (he serves less than 9 months). The first revenue flight for Belgium's Sabena Airlines takes place. April 6 – Italian