of British revolutionary socialist groups meet at the Cannon Street Hotel in London and agree to form the Communist Party of Great Britain. August August 3 – Irish War of Independence: Catholics riot in Belfast, in protest at the continuing British Army presence. August 10 – Ottoman Sultan Mehmed VI's representatives sign the Treaty of Sèvres with the Allied Powers, confirming arrangements for the partitioning of the Ottoman Empire. August 11 – Bolshevik Russia recognizes independent Latvia. August 13–25 – Polish–Soviet War: Battle of Warsaw – The Red Army is defeated. August 13 – Irish War of Independence: The Restoration of Order in Ireland Act (passed by the Parliament of the United Kingdom) receives Royal Assent, providing for Irish Republican Army activists to be tried by court-martial, rather than by jury in criminal courts. August 14 – The 1920 Summer Olympics open in Antwerp, Belgium. August 19 – Russian Civil War: Peasants in Tambov Governorate begin the Tambov Rebellion against the Bolshevik government of Soviet Russia. August 19–25 – Second Silesian Uprising: The Poles in Upper Silesia rise up against the Germans. August 20 – The first commercial radio station in the United States, 8MK (WWJ), begins operations in Detroit. It is owned by the Detroit News, the first U.S. radio station owned by a newspaper. August 26 – The Nineteenth Amendment to the United States Constitution is ratified, guaranteeing women's suffrage. August 28–September 2 – Bukhara operation: The Russian Red Army and Young Bukharians overthrow the Emirate of Bukhara, leading to the establishment of the Bukharan People's Soviet Republic. September September 5 Mahatma Gandhi launches the Non-Cooperation Movement in India, with the goal of obtaining independence from British rule Presidential elections begin in Mexico. September 8 – Gabriele D'Annunzio proclaims the Italian Regency of Carnaro in the city of Fiume. September 9 – The Lotta Svärd women's paramilitary auxiliary is founded in Finland. September 12 – The position of Patriarch of the Serbs is re-established as the authority over the Serbian Orthodox Church, almost 156 years to the day after it was abolished by the Ottoman Empire in 1766. September 16 – Wall Street bombing: A bomb in a horse wagon explodes in front of the J. P. Morgan Building in New York City, killing 38 and injuring 400. September 16 – The Latvian Land Reform of 1920 is adopted by the Constitutional Assembly of Latvia. September 17 –