* January 21: The United States Supreme Court rules in *Bailey v. Drexel Furniture Co.* that the Sherman Antitrust Act does not apply to resale price maintenance.
* February 25: The Red Army enters Petrograd, marking the end of the Russian Civil War.
* March 4: Warren G. Harding is inaugurated as the 29th president of the United States.
* April 18: The Emergency Quota Act is passed, limiting immigration from Southern and Eastern Europe.
* May 31: The Tulsa Race Massacre begins in Oklahoma, resulting in the deaths of hundreds of African Americans.
* June 10: The Treaty of Versailles is signed, officially ending World War I.
* August 2: Alexander Graham Bell makes the first transcontinental telephone call from New York City to San Francisco.
* November 11: Armistice Day is celebrated for the first time in the United States.
* December 6: The Irish Free State is established.
1922
* January 1: The Washington Naval Treaty is signed, limiting the size of the navies of the United States, Britain, Japan, France, and Italy.
* February 25: The Genoa Conference on economic reconstruction in Europe begins.
* March 4: Benito Mussolini becomes prime minister of Italy.
* April 16: The Irish Civil War begins.
* May 29: The first Indianapolis 500 is held.
* June 18: The Teapot Dome scandal is revealed.
* July 24: The International Court of Justice is established in The Hague.
* August 2: Warren G. Harding dies in office, and Calvin Coolidge becomes the 30th president of the United States.
* September 1: The Great Kanto Earthquake destroys Tokyo and Yokohama, killing over 100,000 people.
* November 4: The Tutankhamun's tomb is discovered in Egypt.
1923
* January 11: French and Belgian troops occupy the Ruhr region of Germany in an attempt to force Germany to pay reparations.
* February 24: The Irish Civil War ends.
* March 4: Calvin Coolidge is inaugurated as the 30th president of the United States.
* April 29: The United States Supreme Court rules in *Meyer v. Nebraska* that the right to teach foreign languages in private schools is protected by the First Amendment.
* May 21: The Dawes Plan is adopted, providing for the reduction of German reparations and the withdrawal of French and Belgian troops from the Ruhr.
* July 24: The Treaty of Lausanne is signed, establishing the modern borders of Turkey.
* August 2: The Ku Klux Klan holds a massive rally in Washington, D.C.
* September 1: The Great Kantō Earthquake destroys Tokyo and Yokohama, killing over 100,000 people.
* October 29: The Turkish Republic is proclaimed, with Mustafa Kemal Atatürk as its first president.
* November 8: The Beer Hall Putsch takes place in Munich, Germany, in an attempt to overthrow the Weimar Republic.
1924
* January 21: Vladimir Lenin dies, and Joseph Stalin becomes the new leader of the Soviet Union.
* February 5: The British Labour Party wins the general election, and Ramsay MacDonald becomes prime minister.
* April 11: The Dawes Plan goes into effect, providing for the reduction of German reparations and the withdrawal of French and Belgian troops from the Ruhr.
* May 21: The United States Congress passes the Immigration Act of 1924, restricting immigration from Southern and Eastern Europe.
* June 10: The League of Nations adopts the Geneva Protocol, providing for the peaceful settlement of international disputes.
* July 24: The Olympic Games open in Paris, France.
* August 2: Calvin Coolidge is elected to a full term as president of the United States.
* September 10: The Kellogg-Briand Pact is signed, outlawing war as an instrument of national policy.
* October 2: The first talking motion picture, *The Jazz Singer*, is released.
* November 4: Herbert Hoover is elected president of the United States.
1925
* January 1: The United States Congress passes the Volstead Act, enforcing the prohibition of alcohol.
* February 25: The Scopes Trial begins in Dayton, Tennessee, over the teaching of evolution in public schools.
* March 4: Calvin Coolidge is inaugurated for a second term as president of the United States.
* April 16: The Locarno Treaties are signed, guaranteeing the borders of Germany, Belgium, France, and Czechoslovakia.
* May 20: Charles Lindbergh makes the first solo transatlantic flight from New York City to Paris.
* June 22: The United States Supreme Court rules in Gitlow v. New York that the First Amendment does not protect speech that advocates the overthrow of the government.
* July 24: The Olympic Games open in Amsterdam, the Netherlands.
* August 2: The Kellogg-Briand Pact is signed, outlawing war as an instrument of national policy.
* September 1: The Great Mississippi Flood begins, causing widespread damage and displacement in the Mississippi River Valley.
* October 29: The Turkish Republic is proclaimed, with Mustafa Kemal Atatürk as its first president.
1926
* January 1: The British General Strike begins, paralyzing the country for nine days.
* February 25: The United States Supreme Court rules in Pierce v. Society of Sisters that the right to educate one's children in private schools is protected by the First Amendment.
* March 4: Calvin Coolidge is inaugurated for a second term as president of the United States.
* April 16: The Locarno Treaties are signed, guaranteeing the borders of Germany, Belgium, France, and Czechoslovakia.
* May 20: Charles Lindbergh makes the first solo transatlantic flight from New York City to Paris.
* June 22: The United States Supreme Court rules in Gitlow v. New York that the First Amendment does not protect speech that advocates the overthrow of the government.
* July 24: The Olympic Games open in Amsterdam, the Netherlands.
* August 2: The Kellogg-Briand Pact is signed, outlawing war as an instrument of national policy.
* September 1: The Great Mississippi Flood begins, causing widespread damage and displacement in the Mississippi River Valley.
* October 29: The Turkish Republic is proclaimed, with Mustafa Kemal Atatürk as its first president.
1927
* January 1: The United States Congress passes the Radio Act of 1927, establishing the Federal Radio Commission.
* February 5: The Lindbergh baby is kidnapped from his home in Hopewell, New Jersey.
* March 4: Herbert Hoover is inaugurated as the 31st president of the United States.
* April 29: The Shanghai Massacre takes place, in which Chinese nationalists kill thousands of Chinese communists and suspected sympathizers.
* May 21: Charles Lindbergh completes his solo transatlantic flight from New York City to Paris.
* June 27: The United States Supreme Court rules in Buck v. Bell that the sterilization of mentally disabled people is constitutional.
* July 24: The Olympic Games open in Amsterdam, the Netherlands.
* August 2: The Kellogg-Briand Pact is signed, outlawing war as an instrument of national policy.
* September 1: The Great Mississippi Flood begins, causing widespread damage and displacement in the Mississippi River Valley.
* October 29: The Turkish Republic is proclaimed, with Mustafa Kemal Atatürk as its first president.
1928
* January 1: The Kellogg-Briand Pact goes into effect, outlawing war as an instrument of national policy.
* February 5: The Lindbergh baby is found dead near his home in Hopewell, New Jersey.
* March 4: Herbert Hoover is inaugurated as the 31st president of the United States.
* April 12: The Shanghai Massacre takes place, in which Chinese nationalists kill thousands of Chinese communists and suspected sympathizers.
* May 20: Amelia Earhart becomes the first woman to fly solo across the Atlantic Ocean.
* June 10: The Italian dictator Benito Mussolini signs the Lateran Treaty with the Vatican, establishing the independence of Vatican City.
* July 24: The Olympic Games open in Amsterdam, the Netherlands.
* August 2: The Kellogg-Briand Pact is signed, outlawing war as an instrument of national policy.
* September 1: The Great Mississippi Flood begins, causing widespread damage and displacement in the Mississippi River Valley.
* October 29: The Turkish Republic is proclaimed, with Mustafa Kemal Atatürk as its first president.
1929
* January 1: The United States Congress passes the Smoot-Hawley Tariff Act, raising tariffs on imported goods.
* February 5: