- June. The Free City Incident occurs, where Soviet forces kill Korean militants who refuse to surrender to them.
- 대한독립군단 결성,자유시 참변이 일어남, 천도교 소년회 창립, 조선어 연구회 창립KO
- 1919February. Inspired by the promotion of self-determination laid out in the Fourteen Points statement, Korean independence activists in Japan publish a February 8 Declaration of Independence. This directly inspires a similar act in Korea three weeks later.
- 1919Korean Declaration of Independence
- 1919Jeamni massacre
- 1919October. The kino-drama, Righteous Revenge, widely considered the first Korean film, premieres at Dansungsa. This marks the anniversary of the modern Korean Film Day, although whether it is truly the first Korean film has been disputed.
- 1919January. Gojong suddenly dies. He was and is still widely believed to have been poisoned by Japan [ko].
- 1919April. The Korean Provisional Government (KPG) is established in exile in Shanghai, and Syngman Rhee is elected its first leader.
- 1919February. The Muo Declaration of Independence [ko] is issued in Manchuria. It is the first such declaration of independence issued by Koreans, although its existence was then and remains relatively unknown.
- 1920Battle of Qingshanli
- 1920Battle of Fengwudong
- 1920April. The Shinhanchon Incident occurs, in which an estimated several hundred Koreans are massacred by the Japanese army in Vladivostok, Far Eastern Republic.
- 1920조선일보,동아일보가 창간됨
- 1920박은식이 한국독립운동지혈사(韓國獨立運動之血史)를 편찬, 회사령 철폐, 산미증식계획 실시, 진주 소년회
- 1920Battle of Samdunja
- 1922December. An Chang-nam becomes the first Korean to fly a plane in Korea.
- 1923Kantō Massacre
- 1923March. The Koryo-saram newspaper Sŏnbong is established. It changed names to the Lenin Kichi in 1938 and Koryo Ilbo in 1991. As of 2023, it is the oldest active Korean-language newspaper outside of the Korean peninsula.
- 1923December. The Government-General of Chōsen Library is established as part of the cultural rule movement. It is eventually succeeded by the National Library of Korea after liberation.
- 1923관세 철폐, 조선 형평사 창립, 국민대표회의
- 1923조선물산장려회가 창립, 육군 주만 참의부 설치, 신은행령
| - December — The first installment of Lu Xun's novel The True Story of Ah Q, the first work written in written vernacular Chinese, was published.
- 1月,第一个“新文学”社团文学研究会成立。7月,郭沫若、郁达夫等人在日本东京成立创造社。10月,學衡社成立。嚴復逝。孫中山到廣州重建軍政府,稱「非常大總統」、中國共產黨宣告成立。外蒙古建立親苏俄的君主立憲政府,並宣布獨立,而北洋政府未予承认並發布聲明予以谴责。ZH
- 1919Treaty of Versailles
- 1919May Fourth Movement
- 1919五四運動。蔡元培辭去北京大學校長職。上海發起中國首次大規模罷工。中華革命黨改組為中國國民黨。北洋政府曹汝霖遭彈劾免職
- 1920Zhili–Anhui War
- 1920Gando Massacre
- 19201920 Hualien earthquake
- 1920爆發京國之爭,教育界做出以北京語音為標準音的決議,在學校推廣新國语。甘肃海原县发生8.5级大地震,是中国有地震记载中最高烈度地震之一,造成234,117到273,400人死亡。西北五马(马家军)联合自治。
- 1922胡適推行白話文運動。汕头市出现强烈台风,造成6万到10万人死亡。伍廷芳逝。劉伯明逝
- 1923《孙文越飞宣言》发表。二七大罢工。孫中山到廣州三建軍政府,準備聯俄容共。中国青年党于巴黎创立。
- 1923January — The KMT and CCP agreed to the First United Front, under which Communists would join the KMT as individuals to help combat warlordism.
- 1923January — The Radio Corporation of China was founded.
| - November — Crown Prince Hirohito becomes regent because his father, Emperor Taisho, contracts a serious illness.
- Four-Power Treaty
- November — Hōshō, the first Japanese aircraft carrier, is launched.
- 原敬暗殺事件。JA
- 1919March — March 1st Movement begins to invigorate the Korean independence movement.
- 1920Japan helps found the League of Nations.
- 1922August — Japan withdraws troops from Siberia.
- 1922February — Five Power Naval Disarmament Treaty is signed.
- 1923Kameido incident
- 1923Fukuda Village Incident
- 1923September — Great Kanto earthquake kills 140,000 people.
| - Tulsa race massacre
- Battle of Blair Mountain
- U.S.–German Peace Treaty
- Emergency Quota Act
- After refusing to sign the Treaty of Versailles and join the League of Nations, the U.S. Senate signed separate treaties with Germany, Austria, and Hungary.
- Washington Disarmament Conference of 1921
- 1919Treaty of Versailles agreed to by victorious powers.
- 1919Great Molasses Flood
- 1919United States Senate rejects Treaty of Versailles and League of Nations
- 1919Black Sox Scandal
- 1919Sherwood Anderson publishes Winesburg, Ohio
- 1919President Wilson has a massive stroke. First Lady Edith Wilson takes over in a "silent coup".
- 191918th Amendment, establishing Prohibition
- 1919Palmer Raids
- 1920Sacco and Vanzetti arrested
- 1920National Football League is formed
- 19201920 U.S. presidential election: Warren G. Harding elected president, and Calvin Coolidge vice president.
- 1920Volstead Act
- 1920Battle of Matewan
- 1920The Great Steel Strike ends
- 1920First radio broadcasts, by KDKA in Pittsburgh and WWJ in Detroit
- 1920Economy collapses. The Depression of 1920–21 begins.
- 192019th Amendment, grants women the right to vote
- 1920March 4, 1921 – Harding becomes the 29th president and Coolidge becomes the 29th vice president
- 1920Esch–Cummins Act
- 1922Lincoln Memorial is dedicated
- 1922Fordney–McCumber Tariff
- 1922The Nine Power Treaty
- 1923Teapot Dome scandal
- 1923Rosewood massacre
- 1923The Cotton Club opens in Harlem
- 1923Bucareli Treaty
- 1923August 2, 1923 – President Harding dies; Vice President Coolidge becomes the 30th president
- 1923Yankee Stadium was built
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