( 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 ).

Shantilal was born in the village of Chansad, Gujarat, on 7 December 1921.

The franchise was founded in Decatur, Illinois, in 1919, and moved to Chicago in 1921.

The party was founded in July 1921 in Shanghai.

* 1921 – The International Working Union of Socialist Parties is founded in Vienna.

* 1921 – The Communist Party of China is founded.

The Alumni Association, one of the oldest in the country, was founded in 1921 by the ex-students of National Council of Education.

As a reaction to their exclusion from political representation, the Kikuyu people, the most subject to pressure by the settlers, founded in 1921 Kenya's first African political protest movement, the Young Kikuyu Association, led by Harry Thuku.

The Communist Party of China was founded by Chen Duxiu and Li Dazhao in the French concession of Shanghai in 1921 as a study society and an informal network.

By 1921, small groups of Marxists existed in six Chinese cities: Shanghai, Peking, Changsha, Wuhan, Canton and Tsinan, with a further group having been founded by Chinese students in Paris.

In August 1921, Mao founded the Self-Study University, through which readers could gain access to Marxist and other revolutionary literature, and which was housed in the premises of the Society for the Study of Wang Fuzhi ( Chuan-shan Hsüeh-she ).

He also took part in the mass education movement to fight illiteracy, founded in 1921 by members of the Chinese Young Men's Christian Association with U. S. backing.

* 1921 – Portuguese Communist Party is founded as the Portuguese Section of the Communist International.

In 1921, Sanger founded the American Birth Control League, which later became the Planned Parenthood Federation of America.

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.

* 1921 – The Communist Party of Spain is founded.

In 1921, Sir George Greenwood, Looney, and others founded The Shakespeare Fellowship, an organization originally dedicated to the discussion and promotion of ecumenical anti-Stratfordian views, but which later became devoted to promoting Oxford as the true Shakespeare.

Neill founded Summerhill School, the oldest existing democratic school in Suffolk, England in 1921.

* 1921 – The Legion of Mary, the largest apostolic organization of lay people in the Catholic Church, is founded in Dublin, Ireland.

The gold rushes of the late 19th century led to the founding of numerous small settlements by immigrants, as such as Argentine Ushuaia in was founded in 1884 and Río Grande in 1921, and the Chilean settlements Puerto Toro and Porvenir in 1892 and 1899 respectively.

In 1921, the Table Tennis Association was founded in Britain, and the International Table Tennis Federation followed in 1926.

* A university is founded in Pécs Hungary ( not to be confused with the present University of Pécs, which was founded in 1921 )

Alessi was founded in 1921 to produce crafted products in metal for eating and drinking, by Giovanni Alessi.

Other major sports clubs were founded in the following years like Grupo Desportivo de Lourenço Marques ( 1921 ), Clube Ferroviário de Lourenço Marques ( 1924 ), Sport Club de Vila Pery ( 1928 ), Clube Ferroviário da Beira ( 1943 ), Grupo Desportivo da Companhia Têxtil do Punguè ( 1943 ), and Sport Lourenço Marques e Benfica ( 1955 ).

The Institute was founded in 1921, as the Institute for Theoretical Physics of the University of Copenhagen, by the Danish theoretical physicist Niels Bohr, who had been on the staff of the University of Copenhagen since 1914, and who had been lobbying for its creation since his appointment as professor in 1916.

Nonviolent means of resistance began to take place of armed rebellions and the most prominent organization was the Taiwanese Cultural Association ( 台灣文化協會 ), founded in 1921.