WHAT HAPPENED IN 1921.
Look what happened the 1921.

The New Economic Policy is implemented by the Bolshevik Party in response to the economic failure as a result of War Communism. (21. March 1921)

The Royal Australian Air Force is formed. (31. March 1921)

The Autonomous Government of Khorasan, a military government encompassing the modern state of Iran, is established. (2. April 1921)

Emir Abdullah establishes the first centralised government in the newly created British protectorate of Transjordan. (11. April 1921)

Black Friday: mine owners announce more wage and price cuts, leading to the threat of a strike all across England. (15. April 1921)

The U.S. Congress passes the Emergency Quota Act establishing national quotas on immigration. (19. May 1921)

The trial of Sacco and Vanzetti opens. (24. May 1921)

Tulsa race riot: civil unrest in Tulsa, Oklahoma. The official death toll is 39, but recent investigations suggest the actual toll may be much higher. (31. May 1921)

Tulsa Race Riot: civil unrest in Tulsa, Oklahoma. (1. June 1921)

Southwark Bridge in London is opened for traffic by King George V and Queen Mary. (6. June 1921)

Workers of Buckingham and Carnatic Mills in the city of Chennai, India, begin a four-month strike. (20. June 1921)

Serbian King Alexander I proclaimed the new constitution of the Kingdom of Serbs, Croats and Slovenes, known thereafter as the Vidovdan Constitution. (28. June 1921)

U.S. President Warren G. Harding appoints former President William Howard Taft Chief Justice of the United States. (30. June 1921)

The Communist Party of China is founded. (1. July 1921)

Belfast's Bloody Sunday: 16 people are killed and 161 houses destroyed during rioting and gun battles in Belfast, Northern Ireland. (10. July 1921)

A truce in the Irish War of Independence comes into effect. (11. July 1921)

The Red Army captures Mongolia from the White Army and establishes the Mongolian People's Republic. (11. July 1921)

Former President of the United States William Howard Taft is sworn in as 10th Chief Justice of the U.S. Supreme Court, becoming the only person ever to hold both offices. (11. July 1921)

Researchers at the University of Toronto led by biochemist Frederick Banting prove that the hormone insulin regulates blood sugar. (27. July 1921)

Adolf Hitler becomes leader of the National Socialist German Workers Party. (29. July 1921)