Editing 1921 (section)

== Events ==

=== January ===
{{Main|January 1921}}
* [[January 2]]
** The [[Association football]] club [[Cruzeiro Esporte Clube]], from [[Belo Horizonte]], is founded as the multi-sports club Palestra Italia by Italian expatriates in [[First Brazilian Republic|Brazil]].<ref>{{cite book|first=Alex |last=Bellos|title=Futebol: The Brazilian Way of Life - Updated Edition|url=https://books.google.com/books?id=dE9xAwAAQBAJ&pg=PA408|date=2014|publisher=A&C Black|isbn=978-1-4088-5416-7|pages=408–}}</ref>
** The Spanish liner ''Santa Isabel'' breaks in two and sinks off Villa Garcia, Mexico, with the loss of 244 of the 300 people on board.<ref name=Times050121a>{{cite news |newspaper=[[The Times]] |title=Santa Isabel disaster |date=5 January 1921 |page=9 |issue=42610}}</ref>
* [[January 16]] &ndash; The [[Marxist Left in Slovakia and the Transcarpathian Ukraine]] holds its founding congress in [[Ľubochňa]].<ref>{{cite book|author1=Yeshayahu A. Jelinek|author2=Yešaʻyāhû Yelîneq|author3=Yeshayahu Jelinek|title=The Lust for Power: Nationalism, Slovakia, and the Communists, 1918-1948|url=https://books.google.com/books?id=O8dnAAAAMAAJ|year=1983|publisher=East European Monographs|isbn=978-0-88033-019-0|page=7}}</ref>
* [[January 17]] &ndash; The first recorded public performance of the illusion of "[[sawing a woman in half]]" is given by English stage magician [[P. T. Selbit]] at the [[Finsbury Park]] Empire variety theatre in London.<ref>{{cite book|first=Jim|last=Steinmeyer|authorlink=Jim Steinmeyer|title=Hiding the Elephant: How Magicians Invented the Impossible|publisher=Random House|year=2003|pages=277–295}}</ref> 
* [[January 20]] &ndash; [[British K-class submarine]] [[HMS K5|HMS ''K5'']] sinks in the [[English Channel]]; all 57 on board are lost.<ref>{{cite book|first1=Stephen |last1=Courtney|first2=Brian |last2=Patterson|title=Home of the Fleet: A Century of Portsmouth Royal Dockyard in Photographs|url=https://books.google.com/books?id=7RM7AwAAQBAJ&pg=PT56|date=2009|publisher=History Press|isbn=978-0-7509-5653-6|pages=56}}</ref>
* [[January 21]] &ndash; The full-length [[Silent film|silent]] [[comedy drama]] film ''[[The Kid (1921 film)|The Kid]]'', written, produced, directed by and starring [[Charlie Chaplin]] (in his Tramp character), with [[Jackie Coogan]], is released in the United States.{{citation needed|date=May 2025}}
* [[January 25]] &ndash; [[Italian battleship Leonardo da Vinci|Italian battleship ''Leonardo da Vinci'']] is righted in [[Taranto]] Harbour.{{citation needed|date=May 2025}}

=== February ===
{{Main|February 1921}}
* [[February 12]] &ndash; [[Red Army invasion of Georgia]]: The [[Democratic Republic of Georgia]] is invaded by forces of [[Russian Soviet Federative Socialist Republic|Bolshevist Russia]].<ref>{{cite book|editor-first=John |editor-last=Paxton|title=The Statesman's Year-Book 1974-75: The Encyclopaedia for the Businessman-of-the-World|url=https://books.google.com/books?id=vI3JDQAAQBAJ&pg=PA1428|date=2016|publisher=Springer|isbn=978-0-230-27103-6|pages=1428}}</ref>
* [[February 19]] &ndash; The [[French Third Republic]] and [[Second Polish Republic]] form a defensive alliance.<ref>{{cite web |url=http://untreaty.un.org/unts/60001_120000/20/24/00039182.pdf |archive-url=https://web.archive.org/web/20120111180924/http://untreaty.un.org/unts/60001_120000/20/24/00039182.pdf |archive-date=11 January 2012 |publisher=Société des Nations.|title=Recueil des traités|volume=449 |url-status=dead}}</ref>
* [[February 20]] &ndash; The [[Young Communist League of Czechoslovakia]] is founded.<ref>{{cite book|title=Czechoslovak Life|url=https://books.google.com/books?id=amsOAQAAMAAJ|year=1981|publisher=Orbis|page=14}}</ref>
* [[February 21]]
** [[1921 Persian coup d'état]]: [[Rezā Shāh|Rezā Khan]] and [[Zia'eddin Tabatabaee]] stage a [[coup d'état]] in [[Qajar dynasty]] [[Iran]].<ref>{{cite book|first=Cosroe |last=Chaquèri |author-link=Khosrow Shakeri Zand |title=The Soviet Socialist Republic of Iran, 1920-1921: Birth of the Trauma|url=https://books.google.com/books?id=8NltAAAAMAAJ|year=1995|publisher=University of Pittsburgh Press|isbn=978-0-8229-3792-0|page=307}}</ref>
** [[Conference of London of 1921–1922]] convenes in an attempt to resolve problems arising from the [[dissolution of the Ottoman Empire]].{{citation needed|date=May 2025}}
* [[February 23]] &ndash; The moderately conservative public official [[Oscar von Sydow]] takes over the Swedish premiership from Baron Louis De Geer the Younger.<ref>{{cite book|title=The New International Year Book|url=https://books.google.com/books?id=xyZNAQAAMAAJ|year=1922 |publisher=Dodd, Mead and Company|page=685}}</ref>
* [[February 25]] &ndash; [[Red Army invasion of Georgia]]: The [[Red Army]] enters the [[Democratic Republic of Georgia|Georgian]] capital [[Tbilisi]] and occupies the country, installing a new government and proclaiming the Georgian Soviet Republic.<ref>{{cite book|editor-first1=F. J. Ferdinand Joseph Maria |editor-last1=Feldbrugge|editor-first2=Gerard Pieter |editor-last2=Van den Berg|editor-first3=William Bradford |editor-last3=Simons|title=Encyclopedia of Soviet Law|url=https://books.google.com/books?id=j7gBESqTciYC&pg=PA464|date=1985|publisher=Brill|isbn=90-247-3075-9|pages=464}}</ref>
* [[February 27]] &ndash; A Socialist congress at [[Vienna]] ends with the [[International Working Union of Socialist Parties]] founded.<ref>{{cite book|title=To the Masses: Proceedings of the Third Congress of the Communist International, 1921 |editor-first=John |editor-last=Riddell |url=https://books.google.com/books?id=PFLoBgAAQBAJ&pg=PA59|date=2015|publisher=BRILL|isbn=978-90-04-28803-4|pages=59}}</ref>
* [[February 28]] &ndash; The [[Kronstadt rebellion]] is initiated by sailors of the [[Soviet Navy]]'s [[Baltic Fleet]].<ref>{{cite book|title=Soviet Life|url=https://books.google.com/books?id=e7UaAQAAMAAJ&pg=RA5-PA13|year=1970|publisher=Embassy of the Union of the Soviet Socialist Republics in the USA|pages=5}}</ref>

=== March ===
{{Main|March 1921}}
* March &ndash; The [[Group Settlement Scheme]] in [[Western Australia]] begins.<ref>{{cite book|first=Graeme Donald |last=Snooks |author-link=Graeme Snooks|title=Depression and Recovery in Western Australia, 1928/29-1938/39: A Study in Cyclical and Structural Change|url=https://books.google.com/books?id=5SbUAAAAMAAJ|year=1974|publisher=University of Western Australia Press|isbn=978-0-85564-076-7|page=54}}</ref>
* [[March 1]]
** The city of [[Kiryū, Gunma|Kiryū]], located in [[Gunma Prefecture]], Japan, is founded.{{citation needed|date=May 2025}}
** The [[Australia national cricket team]], led by [[Warwick Armstrong]], becomes the first to complete a [[Whitewash (sport)|whitewash]] of the touring England team in [[The Ashes]], something that will not be repeated for 86 years.<ref>{{Cite web |title=Warwick Armstrong {{!}} cricket.com.au |url=https://www.cricket.com.au/players/CA:1388/warwick-armstrong#:~:text=The%201920/21%20side%20became,supreme%20talent%20on%20the%20field. |access-date=2025-05-23 |website=www.cricket.com.au |language=en}}</ref>
* [[March 5]] &ndash; [[Irish War of Independence]]: [[Clonbanin ambush]]: A force of about 100 [[Irish Republican Army]] members attacks a British Army convoy of 40 soldiers, killing several, including [[Brigadier General]] [[Hanway Robert Cumming|Cumming]].<ref>{{cite book|author-link=Padraic O'Farrell |first=Padraic |last=O'Farrell|title=Who's Who in the Irish War of Independence, 1916-1921|url=https://books.google.com/books?id=2YtnAAAAMAAJ|year=1980|publisher=Mercier Press|page=40}}</ref>
* [[March 6]] – The [[Allies of World War II|Allied Powers]] force [[Weimar Republic|Germany]] to pay war reparations.<ref>{{Cite news |date=March 7, 1921 |title=PENALTIES TO BE PUT INTO EFFECT |url=https://archive.org/details/cgl_001450/mode/1up |work=Glendale Daily Press |pages=1}}</ref>
* [[March 8]]
** Spanish Premier [[Eduardo Dato e Iradier]] is assassinated while exiting the parliament building in [[Madrid]].<ref>{{Cite news |date=1921-03-09 |title=SPANISH PREMIER IS ASSASSINATED, LEAVING CONGRESS; Eduardo Dato, Attacked by Several Persons, Is Slain by Revolver Shots. CAUGHT IN A MOTOR CAR Actual Assassin Used Motorcycle and Fled--ChauffeurIs Also Killed.FRIENDLY TO ALLIES IN WARDato Was Leader of Conservativesand Had Little Sympathyfor Americans. |url=https://www.nytimes.com/1921/03/09/archives/spanish-premier-is-assassinated-leaving-congress-eduardo-dato.html |access-date=2025-05-23 |work=The New York Times |language=en-US |issn=0362-4331}}</ref>
** Allied forces occupy [[Düsseldorf]], Ruhrort and [[Duisburg]].
* [[March 9]] &ndash; [[Cilicia Peace Treaty]] is signed between the [[French Third Republic]] and the [[Turkish National Movement]] in an attempt to end the [[Franco-Turkish War]].<ref>{{Cite web |url=http://www.indiana.edu/~league/1921.htm|title=League of Nations - Chronology 1921 |website=League of Nations Photo Archive |access-date=December 31, 2020|archive-date=December 13, 2010|archive-url=https://web.archive.org/web/20101213062958/http://www.indiana.edu/~league/1921.htm|url-status=dead}}</ref>
* [[March 12]] &ndash; The ''[[İstiklâl Marşı]]'' (Independence March), the Turkish national anthem, is officially adopted.{{citation needed|date=May 2025}}
* [[March 13]] &ndash; [[Occupation of Mongolia]]: The Russian [[White Army]] captures [[Mongolia]] from China; [[Roman von Ungern-Sternberg]] declares himself ruler.{{citation needed|date=May 2025}}
* [[March 14]] &ndash; [[Armenia]]n Soghomon Tehlirian assassinates Mehmed Talaat, former Interior Minister of the [[Ottoman Empire]], in [[Charlottenburg]], Berlin.{{citation needed|date=May 2025}}
* [[March 16]]
** [[Treaty of Moscow (1921)|Treaty of Moscow]] establishes friendly relations between the [[Government of the Grand National Assembly]] of Turkey and the [[Russian Socialist Federative Soviet Republic]].{{citation needed|date=May 2025}}
** Six [[Irish Republican Army]] men of the [[Forgotten Ten]] are hanged in Mountjoy Prison, Dublin.<ref>{{cite book|first=May |last=Moran|title=Executed for Ireland: The Patrick Moran Story|url=https://books.google.com/books?id=sDzBDwAAQBAJ&pg=PT289|date=2010|publisher=Mercier Press Ltd|isbn=978-1-78117-117-2|pages=289}}</ref>
* [[March 17]]
** The [[Red Army]] crushes the [[Kronstadt rebellion]], and a number of sailors flee to Finland.<ref>{{cite book|first=Paul F. |last=Robinson|title=The White Russian Army in Exile, 1920-1941|url=https://books.google.com/books?id=jbhpAAAAMAAJ|year=2002|publisher=Clarendon Press|isbn=978-0-19-925021-9|page=60}}</ref>
** [[Marie Stopes]] opens the first [[birth control]] clinic in the [[Commonwealth of Nations|British Empire]] in London, UK.<ref>{{cite book|first=Audrey |last=Leathard|title=The Fight for Family Planning: The Development of Family Planning Services in Britain, 1921-74|url=https://books.google.com/books?id=SreRAAAAIAAJ|year=1980|publisher=Macmillan|isbn=978-0-333-25954-2|page=1}}</ref>
** The [[Second Polish Republic]] adopts the [[March Constitution of Poland|March Constitution]].{{citation needed|date=May 2025}}
* [[March 18]] &ndash; The second [[Peace of Riga]] ends the [[Polish–Soviet War]]. A permanent border is established between the Polish and Soviet states.{{citation needed|date=May 2025}}
* [[March 20]] &ndash; [[Upper Silesia plebiscite|Upper Silesia]] votes for re-annexation to Germany.<ref>{{cite news |title=Army Ready For Silesian Plebiscite Today |work=[[The New York Times]] |date=March 20, 1921 |p=1}}</ref>
* [[March 21]]
** The [[New Economic Policy]] starts in [[Russian Soviet Federative Socialist Republic|Soviet Russia]].{{citation needed|date=May 2025}}
** [[Irish War of Independence]]: [[Headford Ambush]] &ndash; The [[Irish Republican Army]] kills at least 9 British Army troops.{{citation needed|date=May 2025}}
* [[March 24]] &ndash; The [[1921 Women's Olympiad]] (the first international [[women's sports]] event) begins in Monte Carlo.{{citation needed|date=May 2025}} 
* [[March 31]]
** Abkhazia becomes the [[Socialist Soviet Republic of Abkhazia]].{{citation needed|date=May 2025}}
** The British government formally returns the coal mines from wartime control to their private owners, who demand wage cuts; in response, the [[Miners' Federation of Great Britain]] calls on its partner trade unions in the [[Triple Alliance (1914)|Triple Alliance]] to join it in [[strike action]],<ref>{{cite web|title=Build-up to the General Strike|url=https://warwick.ac.uk/services/library/mrc/archives_online/digital/gs/timeline/before/|publisher=[[Modern Records Centre, University of Warwick]]|location=Coventry|date=2019-08-13|access-date=2020-08-22}}</ref> leading in turn to the government declaring a [[state of emergency]] for the first time under the [[Emergency Powers Act 1920]]. On April 1, a [[Lockout (industry)|lockout]] of striking coal miners begins.<ref name=CentStruggle>{{cite book|title=Century of Struggle|page=39|url=http://num.org.uk/wp-content/uploads/2015/12/Century-of-Struggle-Mini.pdf |archive-url=https://ghostarchive.org/archive/20221009/http://num.org.uk/wp-content/uploads/2015/12/Century-of-Struggle-Mini.pdf |archive-date=2022-10-09 |url-status=live|access-date=2020-08-22}}</ref>

=== April ===
{{Main|April 1921}}
* [[April 11]] &ndash; The [[Emirate of Transjordan]] is created under British Mandate, with [[Abdullah I of Jordan|Abdullah I]] as emir.<ref>{{cite book|author1=ʻAbd al-Salām Majālī|author2=Jawad Ahmed Anani|author3=Munther J. Haddadin|title=Peacemaking: The Inside Story of the 1994 Jordanian-Israeli Treaty|url=https://books.google.com/books?id=ywdIszN8AEQC&pg=PA1|year=2006|publisher=University of Oklahoma Press|isbn=978-0-8061-3765-0|pages=1}}</ref>
* [[April 15]] &ndash; "[[Black Friday (1921)|Black Friday]]" in Britain: transport union members of the '[[Triple Alliance (1914)|Triple Alliance]]' refuse to support national [[strike action]] by coal miners.<ref>{{cite book|first=Gerald |last=Gould|title=The Lesson of Black Friday (ie April 15 1921)|url=https://books.google.com/books?id=7VA8vwEACAAJ|year=1921|publisher=World Microfilms}}</ref>{{page needed|date=May 2025}}
* [[April 20]] &ndash; [[Ferenc Molnár]]'s play ''[[Liliom]]'' is first produced in English on [[Broadway theatre|Broadway]].<ref>{{cite book|first=Lee |last=Kovacs|title=The Haunted Screen: Ghosts in Literature and Film|url=https://books.google.com/books?id=79HGk2CPAPgC&pg=PA107|date=7 November 2005|publisher=McFarland|isbn=978-0-7864-2605-8|pages=107}}</ref> The play would later be adapted as the musical ''[[Carousel (musical)|Carousel]]''.

=== May ===
{{Main|May 1921}}
* [[May 1]]&ndash;[[May 7|7]] &ndash; [[Jaffa riots]]: Riots at [[Jaffa]], [[Mandatory Palestine]] result in 47 Jewish and 48 Arab deaths.{{citation needed|date=May 2025}}
* [[May 2]]&ndash;[[July 5]] &ndash; [[Silesian Uprisings#Third Silesian Uprising (1921)|Third Silesian Uprising]]: Poles in [[Upper Silesia]] rise against the Germans.{{citation needed|date=May 2025}}
* [[May 3]] &ndash; The province of [[Northern Ireland]] is created within the United Kingdom.<ref>{{cite book |author-link=Alvin Jackson (historian) |first=Alvin |last=Jackson |title=Home Rule – An Irish History |publisher=Oxford University Press |year=2004 |pp=368-370}}</ref>
* [[May 5]]
** London Schedule of Payments sets out the [[World War I reparations]] payable by the German [[Weimar Republic]] and other countries considered successors to the [[Central Powers]] &ndash; 132&nbsp;billion gold marks ($33&nbsp;billion), in annual installments of 2.5&nbsp;billion.{{citation needed|date=May 2025}}
** [[Chanel No. 5]] perfume launched by [[Coco Chanel]].<ref>{{cite book|first=Sandrine|last=Papleux|title=Coco Chanel: Une couturière à contre-courant|publisher=50 Minutes|year=2016|isbn=9782806274458|page=26}}</ref>
** Only 13 paying spectators attend the football match between [[Leicester City F.C.|Leicester City]] and [[Stockport County F.C.]] in England, the lowest attendance in [[The Football League]]'s history.<ref>It is estimated that between 1,000 and 2,000 people actually attended the match; [[Manchester United F.C.]] had played a home game at the venue immediately beforehand, and some of the spectators for that match had stayed on to watch the Stockport match for free. However, only thirteen people paid at the gate to watch the Stockport match by itself. {{cite web|url=http://www.footballsite.co.uk/Statistics/Articles/GroundsDoupleUp.htm|title=Two grounds have doubled up on staging League matches on the same day|work=footballsite.co.uk|access-date=2012-05-08|archive-url=https://web.archive.org/web/20130731080311/http://www.footballsite.co.uk/Statistics/Articles/GroundsDoupleUp.htm|archive-date=July 31, 2013|url-status=dead}}</ref>
* [[May 6]] &ndash; The German-Soviet Provisional Agreement is signed: Germany recognises the Soviet government in the [[RSFSR]].{{citation needed|date=May 2025}} 
* [[May 14]]&ndash;[[May 15|15]] &ndash; The major [[May 1921 geomagnetic storm]] occurs.{{citation needed|date=May 2025}}
* [[May 14]]&ndash;[[May 17|17]] &ndash; Violent anti-European riots occur in [[Cairo]] and [[Alexandria]], [[Egypt]].{{citation needed|date=May 2025}}
* [[May 16]] &ndash; The [[Communist Party of Czechoslovakia]] is founded.{{citation needed|date=May 2025}}
* [[May 19]] &ndash; The [[Emergency Quota Act]] is passed by the [[United States Congress]], establishing national quotas on immigration. Because this drastically limits immigration from [[Eastern Europe]], [[Jews]] emigrating from there begin to prefer [[Mandatory Palestine|Palestine]] as a destination rather than the U.S.{{citation needed|date=May 2025}}
* [[May 22]] &ndash; In the first [[golf]] international between the two countries, the United States beats the United Kingdom 9 rounds to 3.{{citation needed|date=May 2025}}
* [[May 23]]&ndash;[[July 16]] &ndash; The [[Leipzig War Crimes Trials]] are held in Germany.{{citation needed|date=May 2025}}
* [[May 24]] &ndash; [[1921 Irish elections]]: In the [[1921 Northern Ireland general election|first Northern Ireland general election]] for the new [[Parliament of Northern Ireland]], [[Ulster Unionists]] win 40 out of 52 seats. The [[dominant-party system]] here will last for fifty years.{{citation needed|date=May 2025}}
* [[May 25]] &ndash; [[Irish War of Independence]]: The [[Irish Republican Army]] occupies and burns [[The Custom House]] in [[Dublin]], the centre of local government in Ireland. Five IRA men are killed, and over 80 are captured by the [[British Army]] which surrounds the building.<ref>{{cite book|title=Michael Collins's Intelligence War|first=Michael T.|last=Foy|year=2006|isbn=0-7509-4267-3|pages=214–218|publisher=Sutton }}</ref>
* [[May 26]] &ndash; A [[general strike]] begins in Norway.{{citation needed|date=May 2025}}
* [[May 31]]&ndash;[[June 1]] &ndash; [[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]].{{citation needed|date=May 2025}}

=== June ===
{{Main|June 1921}}
* [[June 3]] &ndash; The [[death penalty]] is abolished in Sweden.<ref>{{cite book|author=Great Britain. Parliament. House of Commons. Select Committee on Capital Punishment|title=Report from the Select Committee on Capital Punishment Together with the Proceedings of the Committee, and the Minutes of Evidence: Taken Before the Select Committee on Capital Punishment in 1929-1930|url=https://books.google.com/books?id=VKJCAAAAIAAJ|year=1931|publisher=H.M. Stationery Office|page=604}}</ref>
* [[June 10]] &ndash; Paris declaration: Representatives of the three states of [[Transcaucasia]] and the [[North Caucasus]] (the [[Armenian Soviet Socialist Republic|Armenian]], [[Azerbaijan Soviet Socialist Republic|Azerbaijani]] and [[Georgian Soviet Socialist Republic|Georgian]] [[Republics of the Soviet Union|Socialist Soviet Republics]]) proclaim their independence, establishing a customs union and military alliance, not internationally recognized.<ref>{{cite book|first=Georges|last=Mamoulia|title=Les combats indépendantistes des Caucasiens, entre URSS et puissances occidentales: le cas de la Géorgie, 1921-1945|publisher=Harmattan|year=2009|isbn=9782296094765|page=46}}</ref>
* [[June 15]]
** [[Compagnie Générale Transatlantique]]'s liner {{SS|Paris|1916}} makes her maiden voyage from [[Le Havre]] to [[New York City|New York]].<ref>{{cite book|first=Patrick|last=Beauchet|title=Ma vie à bord des cargos et cargos mixtes de la Compagnie Générale Transatlantique|publisher=Société des Ecrivains|year=2015|isbn=9782342038651|page=209}}</ref>
** 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.<ref>{{cite web|url=https://www.nrcs.usda.gov/wps/portal/nrcs/detail/nv/about/?cid=nrcs144p2_037528|title=Women in History: Bessie Coleman|last=Onkst|first=David H.|year=2016|website=Natural Resources Conservation Service Nevada|access-date=November 20, 2020|archive-date=February 16, 2016|archive-url=https://web.archive.org/web/20160216203428/http://www.nrcs.usda.gov/wps/portal/nrcs/detail/nv/about/?cid=nrcs144p2_037528|url-status=dead}}</ref>
* [[June 21]] &ndash; The [[International Hydrographic Organization|International Hydrographic Bureau]] (IHB) is established as an agency of the [[League of Nations]]; it continues in this form until [[April 19]], [[1946]].{{citation needed|date=May 2025}}
* [[June 22]]&ndash;[[July 12]] &ndash; The [[3rd World Congress of the Comintern|Third Congress]] of the [[Communist International]] takes place.{{citation needed|date=May 2025}}
* [[June 27]] &ndash; The first signings of [[Treaty 11]], an agreement between [[George V]], King of Canada, and various Canadian [[First Nations in Canada|First Nations]], are conducted at [[Fort Providence]].{{citation needed|date=May 2025}}
* [[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.{{citation needed|date=May 2025}}
** The coal [[Strike action|strike]] in the United Kingdom ends with the [[Miners' Federation of Great Britain]] obliged to accept pay cuts.<ref name=CentStruggle/>

=== July ===
{{Main|July 1921}}
* [[July 1]] 
** The [[Chinese Communist Party]] (CCP) is founded.<ref>{{cite book|title=Summary of World Broadcasts: Asia, Pacific|url=https://books.google.com/books?id=Pv5WAAAAMAAJ|year=1996|publisher=British Broadcasting Corporation|page=D-2}}</ref>
** The first [[Bacillus Calmette-Guérin|BCG]] vaccination against [[tuberculosis]] is given, in Paris, France; the recipient is a newborn child.<ref>{{cite book|author=Unesco|title=The Unesco Courier|url=https://books.google.com/books?id=wEFPAQAAIAAJ|year=1964|publisher=UNESCO|page=11}}</ref>
* [[July 2]] &ndash; U.S. President [[Warren Harding]] signs a joint congressional resolution, declaring an end to America's state of war with Germany, Austria and Hungary.<ref>{{cite news|title=Harding Ends War; Signs Peace Decree at Senator's Home. Thirty Persons Witness Momentous Act in Frelinghuysen Living Room at Raritan.|url=https://www.nytimes.com/1921/07/03/archives/harding-ends-war-signs-peace-decree-at-senators-home-thirty-persons.html|newspaper=[[The New York Times]]|date=3 July 1921}}</ref>
* [[July 4]] &ndash; A new conservative government is formed in Italy by [[Ivanoe Bonomi]]. <ref>{{cite book|author1=Victor Lincoln Albjerg|author2=Esther Marguerite Hall Albjerg|author3=Marguerite Hall Albjerg|title=Europe from 1914 to the Present|url=https://archive.org/details/europefrom1914to00albj|url-access=registration|year=1951|publisher=McGraw-Hill|page=[https://archive.org/details/europefrom1914to00albj/page/218 218]}}</ref>
* [[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]].<ref>{{cite book|author=Professor Sean Mcconville|title=Irish Political Prisoners 1848-1922: Theatres of War|url=https://books.google.com/books?id=ycr0NN7F8hIC&pg=PA653|date=19 August 2005|publisher=Routledge|isbn=978-1-134-60098-4|pages=653}}</ref>
** The [[Red Army]] captures [[Mongolia]] from the [[White Army]] and establishes the [[Mongolian People's Republic]].{{citation needed|date=May 2025}}
* [[July 14]] &ndash; A Massachusetts jury finds [[Sacco and Vanzetti|Nicola Sacco and Bartolomeo Vanzetti]] guilty of first degree murder following a widely publicized trial whose verdict will spark protests around the world.<ref>[https://www.nytimes.com/1921/07/15/archives/find-italians-guilty-in-paymaster-murder-judge-in-dedham-trial.html "Find Italians Guilty in Paymaster Murder]; Judge in Dedham Trial Charges Jury to Deal With Them as if They Were Americans", ''The New York Times'', July 15, 1921, p. 6</ref>
* [[July 17]] &ndash; The [[Republic of Mirdita]] is proclaimed near the [[Albania]]n-[[Serbia]]n border, with [[Kingdom of Yugoslavia|Yugoslav]] support.{{citation needed|date=May 2025}}
* [[July 21]] 
** [[Rif War]]: [[Battle of Annual]] &ndash; Spanish troops are dealt a crushing defeat at the hands of [[Abd el-Krim]] in Morocco.{{citation needed|date=May 2025}}
** [[Edward Harper (engineer)|Edward Harper]], the "father of broadcasting" in [[Ceylon]], arrives in [[Colombo]] to take up his post as Chief Engineer of the Ceylon Telegraph Department.<ref>{{cite book|first=Nandana |last=Karuṇānāyaka|title=Radio Broadcasting in Sri Lanka: Significant Dates & Events, 1921-1990|url=https://books.google.com/books?id=5MtkAAAAMAAJ|year=1990|publisher=Centre for Media Policy Studies|isbn=978-955-95226-0-7|page=1928}}</ref>
* [[July 23]] &ndash; [[1st National Congress of the Chinese Communist Party]] opens in Shanghai.{{citation needed|date=May 2025}} 
* [[July 26]] &ndash; U.S. President [[Warren G. Harding]] receives Princess Fatima of [[Emirate of Afghanistan|Afghanistan]] who is escorted by imposter [[Stanley Clifford Weyman]].<ref>{{cite web |last1=Chapple |first1=Amos |title=The U.S. President, An Afghan 'Princess,' And The Impostor |url=https://www.rferl.org/a/afghanistan-white-house-impersonator-princess-impostor/31252615.html |website=Radio Free Europe/Radio Liberty |publisher=Radio Free Europe |access-date=21 May 2025}}</ref>
* [[July 27]] &ndash; Researchers at the [[University of Toronto]], led by biochemist [[Frederick Banting]], announce the discovery of the hormone [[insulin]].<ref>{{cite book|author1=Contemporary Books|author2=Agnes Chase|title=Chase's: 2000 calendar of events|url=https://books.google.com/books?id=xHtV8BWnH9IC|date=October 1999|publisher=Contemporary Publishing Group, Incorporated|isbn=978-0-8092-2776-1|page=389}}</ref>
* [[July 29]] &ndash; [[Adolf Hitler]] becomes ''[[Führer]]'' of the [[Nazi Party]] in Germany.<ref>{{cite book
 | last = Evans
 | first = Richard J.
 | author-link = Richard J. Evans
 | title = The Coming of the Third Reich
 | year = 2003
 | publisher = [[Penguin Books]]
 | location = New York
 | isbn = 978-0-14-303469-8
 | title-link = The Coming of the Third Reich
 | page=180
 }}</ref>

[[File:Harvard Square aerial 1921.jpg|thumb|right|An aerial view of Harvard Square in 1921]]

=== August ===
{{Main|August 1921}}
* [[August 5]] &ndash; The first radio baseball game is broadcast: [[Harold Arlin]] announces the Pirates-Phillies game from [[Forbes Field]] over Westinghouse KDKA in [[Pittsburgh]].{{citation needed|date=May 2025}}
* [[August 11]]
** [[Franklin D. Roosevelt's paralytic illness]] strikes while he is vacationing; on August 25 he is diagnosed with [[polio]] and aged 39 becomes permanently disabled.<ref>{{cite book|last=Tobin|first=James|title=The Man He Became: How FDR Defied Polio to Win the Presidency|date=2013|publisher=Simon & Schuster|isbn=978-0743265164|pages=[https://archive.org/details/manhebecamehowfd0000tobi/page/50 50-51]|url=https://archive.org/details/manhebecamehowfd0000tobi/page/50}}</ref>
** The temperature reaches 39 degrees Celsius in [[Breslau]]; the heat wave continues elsewhere in Europe as well.{{citation needed|date=May 2025}}
* [[August 23]] &ndash; King [[Faisal I of Iraq]] is crowned in [[Baghdad]].{{citation needed|date=May 2025}}
* [[August 24]] &ndash; [[R38-class airship]] ZR-2 explodes on her fourth test flight near [[Kingston upon Hull]], England, killing 44 of the 49 Anglo-American crew on board.<ref>{{cite journal|last=Driggs|first=Laurence La Tourette|date=September 7, 1921|title=The Fall of the Airship|journal=[[The Outlook (New York)|The Outlook]]|volume=129|pages=14–15|location=New York|url=https://books.google.com/books?id=sVroBrOJL64C&pg=PA14|access-date=2009-07-30}}</ref>
* [[August 25]] &ndash;  The [[Battle of Blair Mountain]], the largest labor uprising in [[United States history]] and the country's largest peacetime armed uprising, begins in [[Logan County, West Virginia]] as part of the [[Coal Wars]], continuing until September 2.<ref>{{cite book |last=Kinder |first=Chuck |title=Last Mountain Dancer: Hard-Earned Lessons in Love, Loss, and Honky-Tonk |url=https://books.google.com/books?id=9HtRV_OSK1oC |year=2005 |publisher=Da Capo Press |location=New York |isbn=978-0-7867-1653-1 |page=149}}</ref>
* [[August 26]]
** Rising prices cause major riots in [[Munich]].{{citation needed|date=May 2025}}
** Following the assassination of former Finance Minister [[Matthias Erzberger]] by right-wing terrorists, the German government declares martial law.{{citation needed|date=May 2025}}

=== September ===
{{Main|September 1921}}
* [[September 1]] &ndash; [[Poplar Rates Rebellion]]: Nine members of the [[borough council]] of [[Poplar, London]], are arrested.{{citation needed|date=May 2025}}
* [[September 8]] &ndash; [[Margaret Gorman]], 16, wins the Golden Mermaid trophy at a beauty pageant in [[Atlantic City, New Jersey]]; officials later dub her the first [[Miss America]].{{citation needed|date=May 2025}}
* [[September 13]] &ndash; [[White Castle (restaurant)|White Castle]] [[hamburger]] restaurant opens in [[Wichita, Kansas]],<ref>{{cite news|url=http://www.kansas.com/2011/05/12/1845732/buy-sliders-here-for-a-day.html|title=White Castle marks 90th anniversary with one-day return to Wichita|newspaper=[[Wichita Eagle]]|access-date=2012-05-13|date=2011-05-12|first=Beccy|last=Tanner|archive-date=June 27, 2014|archive-url=https://web.archive.org/web/20140627195442/http://www.kansas.com/2011/05/12/1845732/buy-sliders-here-for-a-day.html|url-status=dead}}</ref> foundation of the world's first [[fast food]] chain.
* [[September 21]] &ndash; The [[Oppau explosion]] occurs at [[BASF]]'s [[nitrate]] factory in Oppau, Germany; 500–600 are killed.{{citation needed|date=May 2025}}
* [[September 28]] &ndash; [[Sauerländer Heimatbund]] is founded in [[Meschede]], Germany.<ref>{{cite book|first=Peter |last=Bürger|title="Voll bereit für die Neue Zeit": Deutschnationale, militaristische und NS-freundliche Dichtungen Christine Kochs 1920-1944|url=https://books.google.com/books?id=zt-LDwAAQBAJ&pg=PA52|date=2019|publisher=BoD – Books on Demand|isbn=978-3-7494-0910-5|pages=52|language=de}}</ref>

=== October ===
{{Main|October 1921}}
* [[3 October]] 
** [[Simko]], the leader of the [[Shekak (tribe)|Shikak tribe]], killed the Iranian commander [[Colonel]] [[Mohammad Taqi Pessian]] by having his head cut off in the [[Battle of Jafarabad (1921)]], which was the first incident of his [[Simko Shikak revolt (1918–1922)|rebellion]].{{citation needed|date=May 2025}}
* [[October 5]]
** The [[World Series]] baseball game in North America is first broadcast on the radio, by [[Newark, New Jersey]], station WJZ, [[Pittsburgh]] station KDKA, and a group of other commercial and amateur stations throughout the eastern United States.{{citation needed|date=May 2025}}
** [[Constitution of Liechtenstein]] granted by [[Johann II, Prince of Liechtenstein]], making the country a [[constitutional monarchy]].<ref>{{cite book|authorlink=Dieter Nohlen|last1=Nohlen|first1=D.|last2=Stöver|first2=P.|year=2010|title=Elections in Europe: A Data Handbook|pages=1156–8|publisher=Nomos |isbn=978-3-8329-5609-7}}</ref>
* [[October 7]]
**During his [[Simko Shikak revolt (1918-1922)|first rebellion]], [[Simko Shikak]] launched an attack on the Savujbulak district of [[Mahabad]] in 1921. With a force of approximately 3,900, he attacked the Gendarmes, killing 400 of them and looting the local population.{{citation needed|date=May 2025}}
* [[October 8]] &ndash; The first [[Sweetest Day]] is staged in [[Cleveland, Ohio]].{{citation needed|date=May 2025}}
* [[October 10]] &ndash; Teaching at the [[University of Szeged]] begins, in the [[Kingdom of Hungary]].{{citation needed|date=May 2025}}
* [[October 11]] &ndash; The [[Anglo-Irish Treaty#Negotiations|Irish Treaty Conference]] opens in London.<ref name="Cassell's Chronology">{{cite book|first=Hywel|last=Williams|title=Cassell's Chronology of World History|url=https://archive.org/details/cassellschronolo0000will/page/490|url-access=registration|location=London|publisher=Weidenfeld & Nicolson|year=2005|isbn=0-304-35730-8|pages=[https://archive.org/details/cassellschronolo0000will/page/490 490–491]}}</ref>
* [[October 13]]
** The [[Treaty of Kars]] is signed between the [[Government of the Grand National Assembly]] of Turkey and the [[Armenian Soviet Socialist Republic|Armenian]], [[Azerbaijan Soviet Socialist Republic|Azerbaijani]] and [[Georgian Soviet Socialist Republic|Georgian]] [[Republics of the Soviet Union|Socialist Soviet Republics]] in [[Transcaucasia]], establishing common boundaries.<ref>{{cite book|first=H. B.|last=Paksoy|title=Essays on Central Asia|url=https://books.google.com/books?id=vNRcQnlkQLgC&pg=PA286|publisher=Carrie/EUI|year=1999|pages=286}}</ref>
** Swedish Social Democratic party leader [[Hjalmar Branting]] becomes yet again Prime Minister, after strong general election gains for his party.{{citation needed|date=May 2025}}
* [[October 19]] &ndash; '[[Bloody Night]]' (''Noite Sangrenta''): A massacre in [[Lisbon]] claims the lives of Portuguese Prime-Minister [[António Granjo]] and other politicians.{{citation needed|date=May 2025}}
* [[October 20]] &ndash; [[Treaty of Ankara (1921)|Treaty of Ankara]] signed between the [[French Third Republic]] and the [[Government of the Grand National Assembly]] of Turkey, ending the [[Franco-Turkish War]].{{citation needed|date=May 2025}}
* [[October 21]] &ndash; [[George Melford]]'s wildly successful silent film ''[[The Sheik (film)|The Sheik]]'', which will propel its leading actor [[Rudolph Valentino]] to international stardom, premieres in Los Angeles.{{citation needed|date=May 2025}}
* [[October 24]] &ndash; In the continuing [[Rif War]], the Spanish Army defeats rifkabyl rebels in [[Morocco]].{{citation needed|date=May 2025}}
* [[October 29]] &ndash; In the United States:
** Construction of the [[Link River Dam]], a part of the [[Klamath Project]] in [[Oregon]], is completed.<ref>{{cite book|first=Eric A. |last=Stene|title=The Klamath Project|url=https://books.google.com/books?id=cE7gqsKqLb0C&pg=PA20|year=1994|publisher=Bureau of Reclamation History Program|pages=20}}</ref>
** [[Centre College]]'s [[American football]] team, led by quarterback [[Bo McMillin]], defeats [[Harvard Crimson football|Harvard University]] 6–0, to break Harvard's five-year winning streak. For decades afterward, this is called "football's upset of the century."{{citation needed|date=May 2025}}

=== November ===
{{Main|November 1921}}
* [[November 4]] &ndash; After a speech by [[Adolf Hitler]] in the [[Hofbräuhaus]] in [[Munich]] (Germany), members of the ''[[Sturmabteilung]]'' ("brownshirts") physically assault his opposition.<ref>{{cite book|first=Alan |last=Bullock|title=Hitler and Stalin: Parallel Lives|url=https://books.google.com/books?id=jZIiAQAAIAAJ|year=1998|publisher=Fontana Press|isbn=978-0-00-686374-8|page=84}}</ref>
* [[November 9]] &ndash; The [[National Fascist Party]] ({{lang|it|Partito Nazionale Fascista}} or PNF) is founded in [[Kingdom of Italy|Italy]].{{citation needed|date=May 2025}}
* [[November 11]] &ndash; During an [[Armistice Day]] ceremony at [[Arlington National Cemetery]], the [[Tomb of the Unknowns]] is dedicated by [[Warren G. Harding]], President of the United States.<ref>{{cite book|first=Julia |last=Hargrove|title=Tomb of the Unknowns|url=https://books.google.com/books?id=6d9fGqr98zsC&pg=PA5|date=2003|publisher=Lorenz Educational Press|isbn=978-1-57310-405-0|page=5}}</ref>
* [[November 14]] &ndash; The [[Spanish Communist Party]] is founded.<ref>{{cite book|author-link=Víctor Alba |first=Víctor |last=Alba |title=The Communist Party in Spain|url=https://books.google.com/books?id=H0ydA3137WQC&pg=PA63|date=1983|publisher=Transaction Publishers|isbn=978-1-4128-1999-2|page=63}}</ref>
* [[November 23]] &ndash; In the United States, the [[Sheppard–Towner Act]] is signed by President Harding, providing federal funding for maternity and child care.<ref>{{cite book|first=Anna Elizabeth |last=Rude|title=The Sheppard-Towner Act in Relation to Public Health|url=https://books.google.com/books?id=SmvCZRhxXwEC&pg=PA1915|year=1923|publisher=U.S. Government Printing Office|page=1915}}</ref>
* November &ndash; [[Hyperinflation]] is rampant in Germany, where 263 [[German Papiermark|marks]] are now needed to buy a single American dollar, more than 20 times greater than the 12 marks needed in April 1919.<ref>{{cite web|url=http://www.historyhome.co.uk/europe/weimar.htm |title=Weimar Germany 1919-1933 |first=Stephen |last=Tonge|website=Historyhome.co.uk|date=2011-01-05|access-date=2013-03-19}}</ref>

=== December ===
{{Main|December 1921}}
{{unreferenced section|date=May 2025}}
* [[December 1]] &ndash; Rising prices cause riots in [[Vienna]].
* [[December 6]]
** The [[Anglo-Irish Treaty]] establishing the [[Irish Free State]], an independent nation incorporating 26 of Ireland's 32 counties, is signed in London.
** [[Agnes Macphail]] becomes the first woman to be elected to the Canadian Parliament.
* [[December 13]] &ndash; In the [[Four-Power Treaty]] on Insular Possessions, the [[Empire of Japan]], United States, United Kingdom, and [[French Third Republic]] agree to recognize the status quo in the Pacific.
* [[December 23]] &ndash; [[Visva-Bharati College]] is founded by [[Rabindranath Tagore]] in [[Santiniketan]], [[Bengal Presidency]], [[British India]].
* [[December 29]] &ndash; [[William Lyon Mackenzie King]] becomes Canada's tenth [[Prime Minister of Canada|prime minister]]; he will serve for three non-consecutive terms until 1948.

=== Date unknown ===
* Spring &ndash; [[Russian famine of 1921–22]] begins; roughly 5,000,000 die.<ref>{{cite book|title=War, Revolution, and Peace in Russia: The Passages of Frank Golder, 1914–1927 |first1=Bertrand M. |last1=Patenaude |first2=Terrence |last2=Emmons|url=https://books.google.com/books?id=MKEi2NypdYMC&pg=PA89|publisher=Hoover Press|isbn=978-0-8179-9193-7|pages=89}}</ref>
* [[Luxury goods]] brand [[Gucci]] is founded in [[Florence]], [[Italy]].<ref>{{cite web|url=http://www.gucci.com/us/worldofgucci/articles/history-1920|title=Gucci – 1920s|website=gucci.com/us|access-date=2012-03-19|url-status=dead|archive-url=https://web.archive.org/web/20120413223114/http://www.gucci.com/us/worldofgucci/articles/history-1920|archive-date=2012-04-13}}</ref>