1921 events in history

Jan 6 Formation of the Iraqi Army
Jan 9 Greco-Turkish War: The First Battle of İnönü, the first battle of the war, begins near Eskişehir in Anatolia
Jan 12 Acting to restore confidence in baseball after the Black Sox Scandal, Judge Kenesaw Mountain Landis is elected as Major League Baseball's first commissioner
Jan 20 The first Constitution of Turkey is adopted, making fundamental changes in the source and exercise of sovereignty by consecrating the principle of national sovereignty
Feb 15 Kingdom of Romania establishes its legation in Helsinki
Feb 20 The Young Communist League of Czechoslovakia is founded
Feb 21 Constituent Assembly of the Democratic Republic of Georgia adopts the country's first constitution
Feb 21 Rezā Shāh takes control of Tehran during a successful coup
Feb 22 After Russian forces under Baron Roman von Ungern-Sternberg drive the Chinese out, the Bogd Khan is reinstalled as the emperor of Mongolia
Feb 25 Tbilisi, capital of the Democratic Republic of Georgia, is occupied by Bolshevist Russia
Feb 27 The International Working Union of Socialist Parties is founded in Vienna
Mar 1 The Australian cricket team captained by Warwick Armstrong becomes the first team to complete a whitewash of The Ashes, something that would not be repeated for 86 years
Mar 6 Portuguese Communist Party is founded as the Portuguese Section of the Communist International
Mar 8 Spanish Premier Eduardo Dato Iradier is assassinated while exiting the parliament building in Madrid
Mar 12 İstiklal Marşı was adopted in TBMM(Turkish grand national assembly)
Mar 13 Mongolia is proclaimed an independent monarchy, ruled by Russian military officer Roman von Ungern-Sternberg as a dictator
Mar 17 The Second Republic of Poland adopts the March Constitution
Mar 18 The second Peace of Riga is signed between Poland and the Soviet Union
Mar 19 Irish War of Independence: One of the biggest engagements of the war takes place at Crossbarry, County Cork. About 100 Irish Republican Army (IRA) volunteers escape an attempt by over 1,300 British forces to encircle them
Mar 21 The New Economic Policy is implemented by the Bolshevik Party in response to the economic failure as a result of War Communism
Mar 31 The Royal Australian Air Force is formed
Apr 2 The Autonomous Government of Khorasan, a military government encompassing the modern state of Iran, is established
Apr 11 Emir Abdullah establishes the first centralised government in the newly created British protectorate of Transjordan
Apr 15 Black Friday: mine owners announce more wage and price cuts, leading to the threat of a strike all across England
May 3 West Virginia becomes the first state to legislate a broad sales tax, but does not implement it until a number of years later due to enforcement issues
May 19 The United States Congress passes the Emergency Quota Act establishing national quotas on immigration
May 24 The trial of Sacco and Vanzetti opens
May 31 Tulsa race riot: civil unrest in Tulsa, Oklahoma. The official death toll is 39, but recent investigations suggest the actual toll may be much higher
Jun 1 Tulsa Race Riot: civil unrest in Tulsa, Oklahoma
Jun 6 Southwark Bridge in London is opened to traffic by King George V and Queen Mary
Jun 20 Workers of Buckingham and Carnatic Mills in the city of Chennai, India, begin a four-month strike
Jun 28 Serbian King Alexander I proclaimed the new constitution of the Kingdom of Serbs, Croats and Slovenes, known thereafter as the Vidovdan Constitution
Jun 30 U.S. President Warren G. Harding appoints former President William Howard Taft Chief Justice of the United States
Jul 1 The Communist Party of China is founded
Jul 2 World War I: U.S. President Warren G. Harding signs the Knox–Porter Resolution formally ending the war between the United States and Imperial Germany
Jul 10 Belfast's Bloody Sunday: Sixteen people are killed and 161 houses destroyed during rioting and gun battles in Belfast, Northern Ireland
Jul 11 Former President of the United States William Howard Taft is sworn in as 10th Chief Justice of the U.S. Supreme Court, becoming the only person ever to hold both offices
Jul 11 The Red Army captures Mongolia from the White Army and establishes the Mongolian People's Republic
Jul 11 A truce in the Irish War of Independence comes into effect
Jul 27 Researchers at the University of Toronto led by biochemist Frederick Banting prove that the hormone insulin regulates blood sugar
Jul 29 Adolf Hitler becomes leader of the National Socialist German Workers Party
Aug 3 Major League Baseball Commissioner Kenesaw Mountain Landis confirms the ban of the eight Chicago Black Sox, the day after they were acquitted by a Chicago court
Aug 14 Tannu Uriankhai, later Tuvan People's Republic is established as a completely independent country (which is supported by Soviet Russia)
Aug 23 British airship R-38 experiences structural failure over Hull in England and crashes in the Humber estuary. Of her 49 British and American training crew, only four survive
Aug 25 The first skirmishes of the Battle of Blair Mountain occur
Aug 27 The British install the son of Sharif Hussein bin Ali (leader of the Arab Revolt of 1916 against the Ottoman Empire) as King Faisal I of Iraq
Sep 5 Roscoe "Fatty" Arbuckle party in San Francisco ends with the death of the young actress Virginia Rappe: One of the first scandals of the Hollywood community
Sep 7 In Atlantic City, New Jersey, the first Miss America Pageant, a two-day event, is held
Sep 7 The Legion of Mary, the largest apostolic organization of lay people in the Catholic Church, is founded in Dublin, Ireland
Sep 8 16-year-old Margaret Gorman wins the Atlantic City Pageant's Golden Mermaid trophy; pageant officials later dubbed her the first Miss America