WHAT ALL HAPPENED MAY TO DECEMBER 1920
Find out what all happened May to December 1920

Treaty of Moscow: Soviet Russia recognizes the independence of the Democratic Republic of Georgia only to invade the country six months later. (7. May 1920)

Polish-Bolshevik War: a decisive Polish victory in the Battle of Komarów. (31. August 1920)

The first radio news program is broadcast by 8MK in Detroit, Michigan. (31. August 1920)

In the United States, KDKA of Pittsburgh, Pennsylvania starts broadcasting as the first commercial radio station. The first broadcast is the result of the United States presidential election, 1920. (2. November 1920)

Irish War of Independence: In retaliation for an IRA ambush, British forces burn and loot numerous buildings in Cork city. Many civilians also reported being beaten, shot at, robbed and verbally abused by British forces. (11. December 1920)

Polish–Soviet War: The Battle of Radzymin concludes; the Soviet Red Army is forced to turn away from Warsaw. (16. August 1920)

During the U.S. Republican National Convention in Chicago, U.S. Republican Party leaders gathered in a room at the Blackstone Hotel to come to a consensus on their candidate for the U.S. presidential election, leading the Associated Press to first coin the political phrase "smoke-filled room". (11. June 1920)

After 74 days on Hunger Strike in Brixton Prison, England, the Sinn Féin Lord Mayor of Cork, Terence MacSwiney died. (25. October 1920)

The Latvian–Soviet Peace Treaty, which relinquished Russia's authority and pretenses to Latvia, is signed, ending the Latvian War of Independence. (11. August 1920)

Polish–Soviet War: Battle of Warsaw, which began on August 13, ends with the Red Army's defeat. (25. August 1920)

The Wall Street bombing: a bomb in a horse wagon explodes in front of the J. P. Morgan building in New York City – 38 are killed and 400 injured. (16. September 1920)

A new border treaty between Germany and Denmark gives northern Schleswig to Denmark. (15. June 1920)

The Fountain of Time opens as a tribute to the 100 years of peace between the United States and Great Britain following the Treaty of Ghent. (1. September 1920)

In the East Prussian plebiscite the local populace decides to remain with Weimar Germany. (11. July 1920)

Construction of the Link River Dam begins as part of the Klamath Reclamation Project. (29. July 1920)

King Constantine I is restored as King of the Hellenes after the death of his son Alexander of Greece and a plebiscite. (19. December 1920)

The Haiyuan earthquake, magnitude 8.5, rocks the Gansu province in China, killing an estimated 200,000. (16. December 1920)

Qantas, Australia's national airline, is founded as Queensland and Northern Territory Aerial Services Limited. (16. November 1920)

Ray Chapman of the Cleveland Indians is hit on the head by a fastball thrown by Carl Mays of the New York Yankees, and dies early the next day. Chapman was the second player to die from injuries sustained in a Major League Baseball game, the first being Doc Powers in 1909. (16. August 1920)

Dimitrios Rallis forms a government in Greece. (5. December 1920)