1921 History Events: What Happened in 1921

History is the path that leads to self-awareness and self-discovery. Information gathered from past events has the ability to influence current decisions, and the events of 1921 continue to shape the globe today.

Diabetes is one of the most common chronic diseases that humans have ever encountered. It wasn’t until July 27, 1921, that scientists at the University of Toronto in Canada were able to isolate insulin, a hormone used to treat diabetes. Insulin became available to diabetics within a year. J. J. R. Macleod and Fredrick Banting were awarded the Nobel Prize in Medicine two years after the isolation was successful.

From 1933 through 1945, the German Workers’ Party, commonly known as the Nazi Party, governed Germany as a whole, setting a precedent in modern warfare. In 1921, the party founded in 1919 elected Adolf Hitler as its leader. Being the party’s head was a stepping stone to Hitler’s appointment as Chancellor of Germany in 1933. The Nazi party was formed by Germans who were dissatisfied with the Treaty of Versailles, which brought World War I to a close. Following Germany’s defeat in World War II, the Nazi Party was outlawed, and its top officials were convicted of war crimes relating to the Holocaust.

By December 9, a young engineer at General Motors (GM), Thomas Midgeley Jr., had become tired of the irritating noises created by internal combustion engines when they were running. These knocking or pinging sounds are quite irritating, so Midgeley experimented with other components until he discovered success with lead. We don’t have to cope with the clattering of motors today thanks to the events of the day. Despite its negative effects on the human body, lead is nevertheless one of the most extensively utilised antiknock agents. Since then, companies have begun to phase out the production of lead-based engines.

Continue reading to discover more about the events of 1921.


(February 08, 1921)
Lana Turner, a seductive Hollywood glamour queen with a troubled private life, was born in the United States.


(May 02, 1921)
Satyajit Ray, the Bengali director who made Indian cinema famous with the Apu Trilogy, was born in Calcutta (Kolkata).

(July 02, 1921)
President Warren G. Harding of the United States signs the Knox-Porter Resolution, officially ending the war between the United States and Germany.

(July 11, 1919)
The Red Army defeats the White Army and creates the Mongolian People's Republic.

(July 18, 1921)
John Glenn, the first American astronaut to orbit the Earth, was born. He completed three orbits in 1962.


(July 27, 1921)
Researchers at the University of Toronto, led by biochemist Frederick Banting, have demonstrated that the hormone insulin is responsible for controlling blood sugar levels in humans.

(December 06, 1921)
The Anglo-Irish Treaty was signed on this day in 1921 by the British government and Irish leaders Arthur Griffith, Michael Collins, and others, establishing the Irish Free State as an independent component of the British Commonwealth. photo source:

Written by James

James has always been intrigued by dinosaurs, the universe, technology, and animals. With a Bachelor of Computer Science and years of writing expertise, he joined World Amazing Facts in 2021 as a staff writer.

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1920 History Events: What Happened in 1920

1922 History Events: What Happened in 1922