( 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 ).

Location of the first Congress of the Chinese Communist Party in July 1921, in Xintiandi, former French Concession, Shanghai.

Between 1921 and 1943 the Communist Party of China was headed by the General Secretary:

During the 10th Party Congress ( March 1921 ) Lenin condemned the Workers Opposition, a faction within the Communist Party, for deviating from communism and accused Trotsky of factionalism.

Location of the first Congress of the Chinese Communist Party in July 1921, in Xintiandi, former French Concession, Shanghai.

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.

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

In 1921 he abandoned the Italian Socialist Party ( PSI ) and adhered to the Italian Communist Party ( PCI ), with which he was elected in the Italian Chamber of Deputies in 1924.

* 1921 – The Communist Party of Spain is founded.

The NEP had been implemented by Lenin in order to ensure the survival of the Communist state following seven years of war ( 1914 – 1921, World War I from 1914 to 1917, and the subsequent Civil War ) and had rebuilt Soviet production to its 1913 levels.

These criticisms were revived on the left of the Russian Communist Party after the 10th Congress in 1921, which introduced the New Economic Policy.

When the Outer Mongolian Revolution of 1921 broke out, Mongolian revolutionaries expelled Russian White Guards ( during the Russian Civil War of 1917-1923 following the Communist October Revolution of 1917 ) from Mongolia, which became independent when the Qing Empire of China collapsed in 1911, with the assistance of the Soviet Red Army.

This position, and the attendant Commission, was set up in 1921 to assist the approximately 1, 500, 000 people who fled the Russian Revolution of 1917 and the subsequent civil war ( 1917 – 1921 ), most of them aristocrats fleeing the Communist government.

In early 1921, when the Communist Party was split into numerous factions and disagreements were threatening to engulf the Party, Zinoviev supported Lenin's faction.

In spring 1921, he joined a Chinese Communist cell.

The Communist Party of China ( CCP ), founded in 1921 by Chen Duxiu with Soviet support, initially collaborated with the Chinese Nationalist Party or Kuomintang ( KMT ), founded by the revolutionary republican Sun Yat-sen. After the unexpected death of Sun in March 1925, a power struggle within the KMT favored Chiang Kai-shek, whose Northern Expedition forces succeeded in wresting control of large areas of China from local warlords, establishing a unified government in Nanjing in April 1927.

People like Chen Duxiu and Li Dazhao shifted more to the Left and were among the leading founders of the 1921 Communist Party of China, whilst other intellectuals, such as the Anarchist writer and agitator, Ba Jin also took part in the movement.

In 1920, he joined the Shanghai Communist Team, and helped to establish the Chinese Communist Party in 1921.

The Soviet NEP ( 1921 – 29 ) was essentially a period of " market socialism " similar to the Dengist reforms in Communist China after 1978 in that both foresaw a role for private entrepreneurs and limited markets based on trade and pricing rather than fully centralized planning.

As a result of the NEP, and the break-up of the landed estates while the Communist Party was strengthening power between 1917 – 1921, the Soviet Union became the world's greatest producer of grain.

In 1921 Liu joined the newly formed Chinese Communist Party ( CCP ).

Chen Duxiu (; October 8, 1879 – May 27, 1942 ) was a Chinese revolutionary socialist, educator, philosopher, and author, who co-founded the Chinese Communist Party ( with Li Dazhao ) in 1921, serving from 1921 to 1927 as its first General Secretary.