– Tulsa Race Massacre (Greenwood Massacre): Mobs of white residents attack black residents and businesses in Greenwood District, Tulsa, Oklahoma. The official death toll is 36, but later investigations suggest an actual figure between 100 and 300. 1,250 homes are destroyed and roughly 6,000 African Americans imprisoned in one of the worst incidents of mass racial violence in the United States. June June 3 – The death penalty is abolished in Sweden. June 10 – Paris declaration: Representatives of the three states of Transcaucasia and the North Caucasus (the Armenian, Azerbaijani and Georgian Socialist Soviet Republics) proclaim their independence, establishing a customs union and military alliance, not internationally recognized. June 15 Compagnie Générale Transatlantique's liner makes her maiden voyage from Le Havre to New York. 29-year-old African American Bessie Coleman obtains her pilot's licence in France and becomes the first black woman to have a pilot's licence. June 21 – The International Hydrographic Bureau (IHB) is established as an agency of the League of Nations; it continues in this form until April 19, 1946. June 22–July 12 – The Third Congress of the Communist International takes place. June 27 – The first signings of Treaty 11, an agreement between George V, King of Canada, and various Canadian First Nations, are conducted at Fort Providence. June 28 The Constitutional Assembly of the Kingdom of Serbs, Croats and Slovenes passes the Vidovdan Constitution, despite a boycott of the vote by the communists, and Croat and Slovene parties. The coal strike in the United Kingdom ends with the Miners' Federation of Great Britain obliged to accept pay cuts. July July 1 The Chinese Communist Party (CCP) is founded. The first BCG vaccination against tuberculosis is given, in Paris, France; the recipient is a newborn child. July 2 – U.S. President Warren Harding signs a joint congressional resolution, declaring an end to America's state of war with Germany, Austria and Hungary. July 4 – A new conservative government is formed in Italy by Ivanoe Bonomi. July 11 The Irish War of Independence ends under the terms of the truce (signed on 9 July) which becomes effective at noon between the British Army and the Irish Republican Army. The Red Army captures Mongolia from the White Army and establishes the Mongolian People's Republic. July 14 – A Massachusetts jury finds Nicola Sacco and Bartolomeo Vanzetti guilty of first degree murder following a widely publicized trial