( Rossum's Universal Robots ) ( 1921 ) – the play that introduced the word robot to the world – were organic artificial humans, the word " robot " has come to primarily refer to mechanical humans, animals, and other beings.

* 1921 – Robert Cliche, Canadian politician and magistrate ( d. 1978 )

* 1921 – Black Friday: mine owners announce more wage and price cuts, leading to the threat of a strike all across England.

* 1921 – Tove Maës, Danish actress ( d. 2011 )

* 1921 – 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.

* 1921 – Georg Alexander, Duke of Mecklenburg ( d. 1996 )

* 1921 – Leo Penn, American director ( d. 1998 )

* 1921 – Ernest Angley, American evangelist and broadcaster

* 1921 – J. James Exon, American politician ( d. 2005 )

They won the first eight matches in succession including a 5 – 0 whitewash in 1920 – 1921 at the hands of Warwick Armstrong's team.

* 2008 – Jake Warren, Canadian diplomat ( b. 1921 )

* 2012 – N. K. P. Salve, Indian politician ( b. 1921 )

The most important Canadian theorist was an American immigrant, Henry Wise Wood, president of the United Farmers of Alberta ( UFA ) during that movement's time as the governing party of the province ( 1921 – 1935 ).

* 1921 – Jack Kramer, American tennis player ( d. 2009 )

* 1921 – 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.

* 1921 – Marilyn Maxwell, American actress ( d. 1972 )

* 1921 – Richard Adler, American songwriter and composer ( d. 2012 )

* 1921 – Hayden Carruth, American poet and critic ( d. 2008 )

* 1999 – Byron Farwell, American historian ( b. 1921 )

The second generation was led by Fernand Braudel ( 1902 – 1985 ) and included Georges Duby ( 1919 – 1996 ), Pierre Goubert ( 1915 – 2012 ), Robert Mandrou ( 1921 – 1984 ), Pierre Chaunu ( 1923 – 2009 ), Jacques Le Goff ( 1924 – ) and Ernest Labrousse ( 1895 – 1988 ).

The Paris Peace Conference of 1919 awarded the area to Greece, however the area definitively reverted to Albanian control in November 1921, following Greece's defeat in the Greco-Turkish War.

This incident, coupled with Stalin's demands for the restitution of the Turkish provinces of Kars, Artvin and Ardahan to the Soviet Union ( which were lost by Turkey with the Russo – Turkish War of 1877 – 1878, but were regained with the Treaty of Kars in 1921 ) was one of the main reasons why Turkey decided to give up its general principle of neutrality in foreign affairs.

* Bloody Sunday ( 1921 ), a day of violence in Belfast, Northern Ireland during the Irish War of Independence

There was no shortage of recruits, many of them unemployed First World War army veterans, and by November 1921 about 9, 500 men had joined.

In 1919, Vertov compiled newsreel footage for his documentary Anniversary of the Revolution ; in 1921 he compiled History of the Civil War.

* 1921 – Pierre Clostermann, French World War II pilot ( d. 2006 )

Following the end of World War I, the Greater Poland Uprising ( 1918 – 1919 ) ensured that most of the region became part of the newly independent Polish state, forming most of Poznań Voivodeship ( 1921 – 1939 ).

Most of those countries engaged in local wars, the largest of them being the Polish-Soviet War ( 1919 – 1921 ).

While emigration began to tail off in England and Wales after the First World War, it continued apace in Scotland, with 400, 000 Scots, ten per cent of the population, estimated to have left the country between 1921 and 1931.

Following the signing in 1921 of the Anglo-Irish Treaty, which ended the War of Independence, a split occurred within the IRA.

The Dáil belatedly accepted responsibility for IRA actions in April 1921, just three months before the end of the Irish War of Independence.

* 1921 – A truce is called in the Irish War of Independence ; see Irish calendar.

* John Brown, Jr. ( Navajo ) ( 1921 – 2009 ), American Navajo Code Talker during World War II

A rising sense of Latvian nationalism from the 1850s onwards bore fruit after World War I when, after two years of struggle in the Russian Civil War, Latvia finally won sovereign independence recognised by Russia in 1920 and by the international community in 1921.

After the First World War, silver and gold issues were ceased and cupro-nickel 25 and 50 penniä and 1 markka coins were introduced in 1921, followed by aluminium-bronze 5, 10 and 20 markkaa between 1928 and 1931.

They played their first-ever County Championship match there in 1921, competing there every season ( except while first-class cricket was suspended during the Second World War ), their last match being against Somerset County Cricket Club in August 1966.

* 2006 – Pierre Clostermann, French World War II pilot ( b. 1921 )

* 1921 – Irish War of Independence: One of the biggest engagements of the war takes place at Crossbarry, County Cork.

* 1921 – The New Economic Policy is implemented by the Bolshevik Party in response to the economic failure as a result of War Communism.

After World War I, Sanger shifted away from radical politics, and she founded the American Birth Control League ( ABCL ) in 1921 to enlarge her base of supporters to include the middle class.

During the Civil War period, he published several theoretical economic works, including the popular primer The ABC of Communism ( with Yevgeni Preobrazhensky, 1919 ), and the more academic Economics of the Transitional Period ( 1920 ) and Historical Materialism ( 1921 ).

In 1914, Australian troops occupied German New Guinea, and it remained under Australian military control through World War I until 1921.

In 1921, War Communism was ended and, under the New Economic Policy ( NEP ), private ownership was allowed for small and medium peasant enterprises.