1920s

Spanish troops in San Sebastián, prior to their departure to the Rif War.

• Turkish War of Independence
  • Greco-Turkish War (May 1919 – October 1922)
  • Turkish–Armenian War (September–December 1920)
  • Franco-Turkish War (December 1918 – October 1921)
  • Royalist and separatist revolts (1919–1923)
• Unification of Saudi Arabia
  • Rashidi–Saudi War (1903–1921)
  • Kuwait–Saudi War (1919–1920)
  • Hejaz–Saudi War (1919–1925)
  • Transjordan-Saudi War (1922–1924)
• Polish–Soviet War (February 1919 – March 1922)
• Irish War of Independence (January 1919 – July 1921)
• Iraqi Revolt (1920)
  

  The British and French colonial empires in 1920
• Rif War (1920–1927)
• Vlora War (1920)
• Second Italo-Senussi War (1923–1932)
• Great Syrian Revolt (1925–1927)
• United States occupation of Nicaragua (1912–1933)
• United States occupation of Haiti (1915–1934)
• United States occupation of the Dominican Republic (1916–1924)

• Russian Civil War (November 1917 – October 1922)
  • Tambov Rebellion (August 1920 – June 1921)
  • Allied intervention in the Russian Civil War (1918–1925)
• Patagonia Rebelde (1920–1922)
• Mahmud Barzanji revolts (1920–1922)
• Irish Civil War (June 28, 1922 – May 24, 1923)
• Cristero War in Mexico (1926-1929)
• Chinese Civil War (first phase 1927–1936)
• Ararat rebellion (1927–1930)
• Kongo-Wara rebellion (1928–1931)
• Afghan Civil War (November 14, 1928 – October 13, 1929)

Adolf Hitler (standing) delivers a speech in February 1925

• Rise of radical political movements such as communism led by the Soviet Union and fascism led by Italy.
• League of Nations and associated bodies as experiment in international cooperation and prevention of wars

• Irish Free State gains independence from the United Kingdom in 1922.
• Egypt officially becomes an independent country through the Declaration of 1922, though it still remains under the military and political influence of the British Empire.

• Washington Naval Conference of 1922
  • followup treaties for the Limitation of Naval Armament
• Geneva Protocol 1925, outlaws poison gas
• Geneva Naval Conference 1927
• Kellogg–Briand Pact (1928) signed by most nations promising not to declare war.
• London Naval Treaty, 1930
• Conference for the Reduction and Limitation of Armaments 1932-1934

• Women's suffrage movement continues to make gains as women obtain full voting rights in the United Kingdom in 1918 (women over 30) and in 1928 (full enfranchisement), in the United States in 1920. Also : full or partial gains in Uruguay 1917; Canada, 1917–1925 except Quebec (1940); Czechoslovakia 1920; Irish Free State, 1922; Burma, 1922; Italy, 1925 (partial); Ecuador 1929.[5]

Prohibition agents emptying barrels of alcohol.

• Prohibition of alcohol occurs in the United States. Prohibition in the United States began January 16, 1919, with the ratification of the Eighteenth Amendment to the U.S. Constitution, effective as of January 17, 1920, and it continued throughout the 1920s. Prohibition was finally repealed in 1933. Organized crime turns to smuggling and bootlegging of liquor, led by figures such as Al Capone, boss of the Chicago Outfit.
• The Immigration Act of 1924 places restrictions on immigration. National quotas curbed most Eastern and Southern European nationalities, further enforced the ban on immigration of East Asians, Indians and Africans, and put mild regulations on nationalities from the Western Hemisphere (Latin Americans).
• The major sport was baseball and the most famous player was Babe Ruth.
• The Lost Generation (which characterized disillusionment), was the name Gertrude Stein gave to American writers, poets, and artists living in Europe during the 1920s. Famous members of the Lost Generation include Cole Porter, Gerald Murphy, Patrick Henry Bruce, Waldo Peirce, Ernest Hemingway, F. Scott Fitzgerald, Zelda Fitzgerald, Ezra Pound, John Dos Passos, and Sherwood Anderson.
• A peak in the early 1920s in the membership of the Ku Klux Klan of four to five million members (after its reemergence in 1915), followed by a rapid decline down to an estimated 30,000 members by 1930.[6]
• The Scopes trial (1925), which declared that John T. Scopes had violated the law by teaching evolution in schools, creating tension between the competing theories of creationism and evolutionism.

The Union of Soviet Socialist Republics (Soviet Union) is created in 1922.

Benito Mussolini and Fascist Blackshirts during the March on Rome in 1922.

• Polish–Soviet War (1920–1921); Poland defeats Soviet expansion; Ukraine and Belarus were divided.
• Major armed conflict in Ireland including Irish War of Independence (1919–1921) resulting in Ireland becoming an independent country in 1922 followed by the Irish Civil War (1922–1923).
• Russian famine of 1921–22 claimed up to five million victims.[7]
• The Union of Soviet Socialist Republics (Soviet Union) is created in 1922.
• Benito Mussolini leader of the National Fascist Party became Prime Minister of Italy, shortly thereafter creating the world's first fascist government. The Fascist regime establishes a totalitarian state led by Mussolini as a dictator. The Fascist regime restores good relations between the Roman Catholic Church and Italy with the Lateran Treaty, which creates Vatican City. The Fascist regime pursues an aggressive expansionist agenda in Europe such as by raiding the Greek island of Corfu in 1923, pressuring Albania to submit to becoming a de facto Italian protectorate in the mid-1920s, and holding territorial aims on the region of Dalmatia in Yugoslavia.
• In Germany, the Weimar Republic suffers from economic crisis in the early 1920s and hyperinflation of currency in 1923. From 1923 to 1925 the Occupation of the Ruhr takes place. The Ruhr was an industrial region of Germany taken over by the military forces of the French Third Republic and Belgium, in response to the failure of the Weimar Republic under Chancellor Wilhelm Cuno to keep paying the World War I reparations. The recently formed fringe National Socialist German Workers' Party (a.k.a. Nazi Party) led by Adolf Hitler attempts a coup against the Bavarian and German governments in the 1923 Beer Hall Putsch, which fails, resulting in Hitler being briefly imprisoned for one year in prison where he writes Mein Kampf.
• Turkish War of Independence (1919—1923).
• United Kingdom general strike (1926).

• The Qajar dynasty ended under Ahmad Shah Qajar as Reza Shah Pahlavi founds the Pahlavi Dynasty, which later became the last monarchy of Iran.
• The Northern Expedition (1926–1928)
• The Chinese Civil War begins (1927–1937).
• In the Kingdom of Afghanistan, Amanullah Khan's reforms cause conflict with conservative factions, resulting in the Afghan Civil War.

• Pan-Africanist supporters of Marcus Garvey's Universal Negro Improvement Association and African Communities League (UNIA-ACL) are repressed by colonial powers in Africa. Garvey's UNIA-ACL supported the creation of a state led by black people in Africa including African Americans.[8]

• John Logie Baird invents the first working mechanical television system (1925). In 1928, he invents and demonstrates the first color television.
• Warner Brothers produces the first movie with a soundtrack Don Juan in 1926, followed by the first Part-Talkie The Jazz Singer in 1927, the first All-Talking movie Lights of New York in 1928 and the first All-Color All-Talking movie On with the Show, 1929. Silent films start giving way to sound films. By 1936, the transition phase arguably ends, with Modern Times being the last notable silent film.
• Karl Ferdinand Braun invents the modern electronic cathode ray tube in 1897. The CRT became a commercial product in 1922.
• Record companies (such as Victor, Brunswick and Columbia) introduce an electrical recording process on their phonograph records in 1925 (that had been developed by Western Electric), resulting in a more lifelike sound.
• The first electric razor is patented in 1928 by the American manufacturer Col. Jacob Schick.
• The first selective Jukeboxes being introduced in 1927 by the Automated Musical Instrument Company.
• Harold Stephen Black revolutionizes the field of applied electronics by inventing the negative feedback amplifier in 1927.
• Clarence Birdseye invents a process for frozen food in 1925.
• Robert Goddard makes the first flight of a liquid-fueled rocket in 1926.

• 
  Robert Goddard and his rocket, 1926
• 
  1920s phone
• 
  Thompson submachine gun (1921 model)

• Charles Lindbergh becomes the first person to fly solo across the Atlantic Ocean (May 20–21, 1927), nonstop from New York to Paris.[10]
• Howard Carter opens the innermost shrine of King Tutankhamun's tomb near Luxor, Egypt, 1922
• Insulin was first used as a medication in Canada by Charles Best and Frederick Banting in 1922.[11]
• In 1928, Alexander Fleming discovers penicillin

• 
  In 1928, Alexander Fleming discovers penicillin
• 
  Howard Carter opens the innermost shrine of King Tutankhamun's tomb near Luxor, Egypt, 1922

Silent films were popular in this decade, with the highest-grossing film of this decade being either 1925 American silent epic adventure-drama film Ben-Hur: A Tale of the Christ or the 1925 American silent war drama film The Big Parade, depending of metrics used: Ben-Hur grossed more during its initial release, but The Big Parade ultimately grossed more via re-releases.

• Oscar winners: Wings (1927–1928), The Broadway Melody (1928–1929), All Quiet on the Western Front (1929–1930)
• First feature-length motion picture with a soundtrack (Don Juan) is released in 1926. First part-talkie (The Jazz Singer) released in 1927, first all-talking feature (Lights of New York) released in 1928 and first all-color all-talking feature (On with the Show) released in 1929.
• The first animated short film by Walt Disney is released in 1928, featuring Mickey Mouse. Steamboat Willie was the first sound cartoon to attract widespread notice and popularity.

The most memorable fashion trend of the Roaring Twenties was undoubtedly "the flapper" look.

The 1920s is the decade in which fashion entered the modern era. It was the decade in which women first abandoned the more restricting fashions of past years and began to wear more comfortable clothes (such as short skirts or trousers). Men also abandoned highly formal daily attire and even began to wear athletic clothing for the first time. The suits men wear today are still based, for the most part, on those worn in the late 1920s. The 1920s are characterized by two distinct periods of fashion. In the early part of the decade, change was slow, as many were reluctant to adopt new styles. From 1925, the public passionately embraced the styles associated with the Roaring Twenties. These styles continued to characterize fashion until the worldwide depression worsened in 1931.

The period from the end of the First World War until the start of the Depression in 1929 is known as the "Jazz Age"

• "The Jazz Age"—jazz and jazz-influenced dance music became widely popular throughout the decade.
• George Gershwin wrote Rhapsody in Blue and An American in Paris.
• Eddie Lang and Joe Venuti were the first musicians to incorporate the guitar and violin into jazz.

• First commercial radio stations in the U.S., 8MK (WWJ) in Detroit and (KDKA 1020 AM) in Pittsburgh, Pennsylvania, go on the air on August 27, 1920.
• Both stations broadcast the election results between Harding and Cox in early November. The first station to receive a commercial license is WBZ, then in Springfield MA, in mid-September 1921. While there are only a few radio stations in 1920–21, by 1922 the radio craze is sweeping the country.
• 1922: The BBC begins radio broadcasting in the United Kingdom as the British Broadcasting Company, a consortium between radio manufacturers and newspapers. It became a public broadcaster in 1926.
• On August 27, 1920, regular wireless broadcasts for entertainment began in Argentina for the first time,[15] by a Buenos Aires group including Enrique Telémaco Susini. The station is soon called Radio Argentina. (See Radio in Argentina.)

• Beginning of surrealist movement.
• Art Deco becomes fashionable.
• The Group of Seven (artists).
• Pablo Picasso paints Three Musicians in 1921.
• René Magritte paints The Treachery of Images.
• Albert Gleizes paints Woman with Black Glove, 1920
• Marcel Duchamp completes The Bride Stripped Bare By Her Bachelors, Even (The Large Glass).
• The Museum of Modern Art opens in Manhattan, November 7, 1929, nine days after the Wall Street Crash.
• The first science fiction comic strip, Buck Rogers, begins January 7, 1929. The first Tarzan comic strip begins on the same date.

The best-selling books of every year in the United States were as follows:[16]

• 1920: The Man of the Forest by Zane Grey
• 1921: Main Street by Sinclair Lewis
• 1922: If Winter Comes by A. S. M. Hutchinson
• 1923: Black Oxen by Gertrude Atherton
• 1924: So Big by Edna Ferber
• 1925: Soundings by A. Hamilton Gibbs
• 1926: The Private Life of Helen of Troy by John Erskine
• 1927: Elmer Gantry by Sinclair Lewis
• 1928: The Bridge of San Luis Rey by Thornton Wilder
• 1929: All Quiet on the Western Front by Erich Maria Remarque

• Art Deco architecture attained its heyday
• Walter Gropius builds the Bauhaus in Dessau
• Le Corbusier published the book Toward an Architecture serving as the manifesto for a generation of architects.

• January 24: Grand Prix de Paris switches its name to Prix de l'Arc de Triomphe (horse race)
• February 13: Negro National League created (baseball)
• April: Babe Ruth began playing for the New York Yankees
• April–September: Summer Olympics held in Antwerp.
• August 17: Ray Chapman from the Cleveland Indians is killed by Carl Mays' pitch (baseball)
• August 20: National Football League founded
• Kenesaw Mountain Landis is named the first Commissioner of Baseball.

• March 26: Schooner Bluenose launched

• May 26: the 24 hours of Le Mans conducts their first sports car race
• October: The New York Yankees win the 1923 World Series, the first title for the team.

• January–February: First Winter Olympic Games takes place in Chamonix France.
• May–July: Summer Olympics held in Paris, France.
• July 10–13: Paavo Nurmi wins five gold medals in Summer Olympics (track and field)

• May 28: French Open invites non-French tennis athletes for the first time
• Germany and Belgium in first handball international tournament.

• August 6: Gertrude Ederle swims English Channel and is first woman to do so.
• September 23: Gene Tunney wins Jack Dempsey's world heavyweight boxing title.

• May 23: Warwickshire end Yorkshire's 71-match unbeaten sequence in the County Championship – the longest unbeaten sequence in that competition.
• June 3: First Ryder Cup golf tournaments are held in Massachusetts

• February: Winter Olympics held in St. Moritz Switzerland.
• May–August: Women's Olympics takes place for first time, in 1928 Summer Olympics held in Amsterdam.
• William Ralph "Dixie" Dean wins the Football League, scores 60 goals in 39 matches for Everton F.C. (English Football)

• The English team led by Wally Hammond defeats Australia in The Ashes series (Test Cricket)

• Youth culture of The Lost Generation; flappers, the Charleston, and the bob cut haircut.
• Fads such as marathon dancing, mah-jong, crossword puzzles and pole-sitting are popular.
• The height of the clip joint.
• The Harlem Renaissance centered in a thriving African American community of Harlem, New York City.
• Since the 1920s scholars have methodically dug into the layers of history that lie buried at thousands of sites across China.
• The tomb of Tutankhamun is discovered intact by Howard Carter (1922). This begins a second revival of Egyptomania.
• Twiglets are invented in December 1929 by Frenchman Rondalin Zwadoodie, and sold by Peek Freans.
• Smoking in America was deemed socially acceptable, with the first magazine advertising women smoking for the first time in 1927.[17]
• Newly improved latex condoms resulted in soaring condom sales in the United States.[17]

Frank Lloyd Wright, 1926

• Marcel Breuer
• Le Corbusier
• Walter Gropius
• Ludwig Mies van der Rohe
• Frank Lloyd Wright

The following articles contain brief timelines listing the most prominent events of the decade:

1920 • 1921 • 1922 • 1923 • 1924 • 1925 • 1926 • 1927 • 1928 • 1929

• Block, Alex Ben; Wilson, Lucy Autrey (2010). George Lucas's Blockbusting: A Decade-by-Decade Survey of Timeless Movies Including Untold Secrets of Their Financial and Cultural Success. Harper Collins. ISBN 978-0-06-196345-2.
• Finler, Joel Waldo (2003). The Hollywood Story. Wallflower Press. ISBN 978-1-903364-66-6.
• Hall, Sheldon (15 April 2010). Epics, Spectacles, and Blockbusters: A Hollywood History. Wayne State University Press. ISBN 978-0-8143-3697-7.