( 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 ).

* 1921 – Adolf von Thadden, German politician ( d. 1996 )

* 1921 – The Sturmabteilung or SA, whose members were known as " brownshirts ", physically assault Adolf Hitler's opposition after his speech in Munich.

In 1921, Adolf Hitler attacked Steiner in an article in the right-wing Völkischer Beobachter newspaper that included accusations that Steiner was a tool of the Jews, and other nationalist extremists in Germany called up a " war against Steiner ".

* 1921 Sommerfeld House, Berlin, Germany designed for Adolf Sommerfeld

* French — Alleaume, Ludovic: Poor Pierrot ( 1915 ); Derain, André: Pierrot ( 1923 – 1924 ), Harlequin and Pierrot ( c. 1924 ); Gabain, Ethel: Many works, including Pierrot ( 1916 ), Pierrot's Love-letter ( 1917 ), and Unfaithful Pierrot ( 1919 ); La Fresnaye, Roger de: Study for " Pierrot " ( 1921 ); La Touche, Gaston de: Pierrot's Greeting ( n. d .); Laurens, Henri: Pierrot ( c. 1922 ); Matisse, Henri: The Burial of Pierrot ( 1943 ); Mossa, Gustav Adolf: Pierrot and the Chimera ( 1906 ), Pierrot Takes His Leave ( 1906 ), Pierrot and His Doll ( 1907 ); Picabia, Francis: Pierrot ( early 1930s ); Renoir, Pierre-Auguste: White Pierrot ( 1901 / 1902 ); Rouault, Georges: Many works, including White Pierrot ( 1911 ), Pierrot ( 1920 ), Pierrot ( 1937 – 1938 ), Pierrot ( or Pierrette ) ( 1939 ), Aristocratic Pierrot ( 1942 ), The Wise Pierrot ( 1943 ), Blue Pierrots with Bouquet ( c. 1946 ).

In 1921 Dr. Walter Morgenthaler published his book Ein Geisteskranker als Künstler ( A Psychiatric Patient as Artist ) on Adolf Wölfli, a psychotic mental patient in his care.

The year 1921, like every year between World War I and Adolf Hitler's rise to power, was for Germany one of gloom, redeemed only by a few bright spots.

* Adolf Appellöf, Swedish zoologist ( 1857 – 1921 )

* Adolf von Hildebrand ( 1847 – 1921 ), sculptor

* 11 July 1921 < span style =" color: red "> Adolf Hitler resigns from the party to force the hand of Anton Drexler not to unite with the DSP .</ span >

* 25 July 1921 < span style =" color: red "> Adolf Hitler rejoins the party .</ span >

* 29 July 1921 < span style =" color: red "> Adolf Hitler assumes leadership of the NSDAP.

* Jan 12, 1922 Adolf Hitler sentenced to three months for disturbance of Sept 14 1921.

* THADDEN, Adolf von ( 1921 – 1996 ) Chairman of the National Democratic Party of Germany.

* Princess Ida Maria Lamberta Theresia Franziska de Paula ( Eisgrub, 17 September 1839 – Libejic, 4 August 1921 ), married in Vienna on 4 June 1857 Adolf Joseph 8te Fürst zu Schwarzenberg ( Vienna, 18 March 1832 – Libejic, 5 October 1914 ), 1, 092nd Knight of the Order of the Golden Fleece in Austria, and had issue

Jakob Johan Adolf Appellöf ( Garda on Gotland 2 November 1857 – 5 January 1921 ) was a Swedish marine zoologist.

In 1921 and 1932 Baur co-authored with Fritz Lenz and Eugen Fischer two volumes that became the book Human Heredity, which was a major influence on the racial theories of Adolf Hitler.

* Adolf von Harnack, head librarian 1905 – 1921

In 1921, fellow Austrian Adolf Loos completed a mausoleum project in Dvořák's name.

A founding member of the NSDAP in 1921 ; after the re-establishment of the party, he rejoined in 1925 and quickly became one of Adolf Hitler's favourites.

* October 6 – Adolf von Hildebrand, sculptor ( d. 1921 )