( 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 ).

Following years of political and military agitation for ' Home Rule ' for Ireland, the Anglo-Irish treaty of 1921 established the Irish Free State ( now the Republic of Ireland ) as a separate state, leaving Northern Ireland as part of the United Kingdom.

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

Negotiations on an Anglo-Irish Treaty took place in late 1921 in London.

Under the terms of the Anglo-Irish agreement of 6 December 1921, which ended the war ( 1919 – 1921 ), Northern Ireland was given the option of withdrawing from the new state, the Irish Free State, and remaining part of the United Kingdom.

In Moore v Attorney-General of the Irish Free State AC 484 ( PC ) the right of the Oireachtas to abolish appeals to the Privy Council was challenged as a violation of the 1921 Anglo-Irish Treaty.

The British government had wanted to exclude from the statute the legislation underpinning the Anglo-Irish Treaty of 1921 from which the Free State's constitution emerged, but the Irish government objected and the other Dominions concurred.

A Anglo-Irish War was fought between Crown forces and the Irish Republican Army between January 1919 and June 1921.

The war ended with the Anglo-Irish Treaty of December 1921 that established the Irish Free State.

Lloyd George presided over the Government of Ireland Act 1920 which established Northern Ireland in May 1921, during the Anglo-Irish War, which led to the negotiation of the Anglo-Irish Treaty in December 1921 with Arthur Griffith and Michael Collins and the formation of the Irish Free State.

Cosgrave broke with Éamon de Valera over the issue of the Anglo-Irish Treaty of 1921.

Peace By Ordeal: An Account from First-Hand Sources of the Negotiation and Signature of the Anglo-Irish Treaty of 1921, published in 1935, is arguably his best known work which documents the negotiations of the Anglo-Irish Treaty of 1921 between the Irish and British representatives.

In December 1921, after the signing of Anglo-Irish Treaty, Lemass was released.

During the debates of the Anglo-Irish Treaty in 1921, Lemass was one of the minority who opposed it along with de Valera.

Meanwhile Michael Collins became Chairman of the Provisional Government of the provisional state created in the 1921 Anglo-Irish Treaty.

The Anglo-Irish Treaty of 1921 provided for the creation of a self-governing Irish dominion, to be called the Irish Free State.

The Irish Oath of Allegiance was a controversial provision in the Anglo-Irish Treaty of 1921, which Irish TDs ( members of the Irish parliament ) and Senators were required to take, in order to take their seats in Dáil Éireann ( Chamber of Deputies ) and Seanad Éireann ( Irish Senate ).

Opposition to this was based on the fact that it was not fully discussed and explained before the Anglo-Irish Treaty was signed in December 1921, and that many of the members of the second Dáil Éireann, elected without opposition in May 1921, had already sworn an Oath to uphold an Irish Republic.

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.

The Treaty of Riga of 1921 settled the eastern border, preserving for Poland, at the cost of partitioning the lands of the former Grand Duchy of Lithuania ( Lithuania and Belarus ) and Ukraine, a good portion of the old Commonwealth's eastern lands.

* 1921 – The Soviet republics of Russia, Armenia, Azerbaijan, and Georgia sign the Treaty of Kars with the Grand National Assembly of Turkey to establish the contemporary borders between Turkey and the South Caucasus states.

Before the Treaty of Rawalpindi was concluded in 1921, Afghanistan had already begun to establish its own foreign policy, including diplomatic relations with the Russian Soviet Federative Socialist Republic in 1919.

In May 1921, the Afghans and the Soviets signed a Treaty of Friendship, Afghanistan's first international agreement since gaining full independence in 1919.

Since 1991 the more than boundary with the former Soviet Union, which was defined in the 1921 Treaty of Moscow ( 1921 ) and Treaty of Kars, has formed Turkey's borders with the independent countries of Armenia, Azerbaijan, and Georgia.

* Treaty of Berlin ( 1921 ), between the United States and Germany

The Polish – Soviet War was particularly bitter and ended by the Treaty of Riga in 1921.

This was known as the Knox – Porter Resolution ; subsequent Peace treaties were signed with both countries and Ratified by the Senate and signed by Harding on July 21, 1921 ; that officially ended World War I for the U. S. The Senate had refused to ratify the Treaty of Versailles in both 1919 and 1920 because it required the U. S. to endorse the League of Nations.

On April 20, 1921, the Thomson – Urrutia Treaty with Colombia was ratified by the Senate and signed by Harding ; that awarded $ 25, 000, 000 as indemnity payment for land used to make the Panama Canal.

The Irish Treaty delegation set up Headquarters in Hans Place, Knightsbridge and on 5 December 1921 at 11: 15 am it was decided by the delegation during private discussions at 22 Hans Place to recommend the Treaty to the Dáil Éireann ; negotiations continued until 2: 30 am on 6 December 1921 after which the Treaty was signed by the parties.