- January 25
- Russia is declared a republic of Soviets. [1]
- January 26
- US food administrator Herbert Hoover calls for "wheatless" and "meatless" days for war effort. [1]
- January 27
- Tarzan of the Apes, first Tarzan film, premieres at Broadway Theater in New York. [1]
- January 28
- Strike on Berlin ammunitions factory. [1]
- Leon Trotsky becomes leader of Reds. [1]
- January 31
- Last day of Old Style calendar in Russia, as it adopts Gregorian calendar; next day is February 14. [66.54] [983.25]
- February 1
- Last day of Gregorian calendar in Estonia. Next day is February 15. [983.24]
- February 3
- Twin Peaks Tunnel, longest (11,920 feet) streetcar tunnel, begins service. [1]
- February 5
- Stephen W Thompson becomes first US pilot to down an enemy airplane. [1]
- Separation of church and state begins in Russia. [1]
- February 6
- Britain grants women (30 and over) the vote. [1]
- February 14
- Soviet Russia adopts New Style (Gregorian) calendar. [1] [983.25]
- February 15
- US army troop ship torpedoed and sunk by Germany, off Ireland. [1]
- Estonia, Latvia and Lithuania adopt the Gregorian calendar. [1] [983.24]
- February 16
- Lithuania declares independence from Russia and Germany (National Day). [1]
- February 21
- Australians chase Turkish troops out of Jericho, Dutch Palestine. [1]
- February 22
- Germany claims Baltic states, Finland and Ukraine from Russia. [1]
- February 24
- Estonia declares independence from Russia. [1]
- February 26
- Stands at Hong Kong Jockey Club collapse and burn, killing 604. [1] [187.219]
- March 3
- Russia withdraws from war, signs Treaty of Brest-Litovsk with Germany and Austria. [1]
- March 4
- Terek Autonomous Republic established in RSFSR (until 1921). [1]
- March 6
- US naval collier Cyclops disappears in Bermuda Triangle. [1]
- March 9
- Russian Bolshevik Party becomes the Communist Party. [1]
- Ukrainian mobs massacre Jews of Seredino Buda. [1]
- March 11
- Moscow becomes capital of revolutionary Russia. [1]
- March 13
- American Red Magen David (Jewish Red Cross) forms. [1]
- March 14
- First concrete ship to cross the Atlantic (Faith) is launched, in San Francisco, California. [1]
- March 18
- Socialist Youth AJC organizes in Amsterdam. [1]
- March 19
- US Congress authorizes time zones and approves daylight saving time. [1] [5]
- S Potter becomes first US pilot to shoot down a German seaplane. [1]
- March 21
- Germany launches the Somme offensive. [1]
- March 23
- Crépy-en-Laonnoise: German artillery shells Paris, France, 256 killed. [1]
- Lithuania proclaims independence. [1]
- France bombs "Thick Bertha's Dike" (nickname for the widow Krupp). [1]
- April 1
- England's Royal Flying Corps replaced by Royal Air Force. [1]
- April 4
- Battle of Somme ends. [1]
- Food riot in Amsterdam. [1]
- April 9
- Latvia proclaims independence from Russia. [1]
- April 13
- Electrical fire kills 38 mental patients at Oklahoma State Hospital. [1]
- April 15
- French Prime Minister Georges Clemenceau publishes secret French/Austrian documents. [1]
- April 21
- Manfred von Richtofen, the "Red Baron", is shot down at age 25. [1]
- April 23
- Battle of Zeebrugge ends. [1]
- April 24
- The first tank-to-tank combat occurs at Villers-Bretonneux, France, when three British Mark IVs meet three German A7Vs. [5]
- May 2
- General Motors acquires the Chevrolet Motor Company of Delaware. [5]
- May 10
- HMS Vindictive sunk to block entrance of Ostend Harbor. [1]
- May 15
- Greek troops lands at Smyrna. [1]
- Hostilities cease in the Finish Civil War. About 37,000 Finns died. [1000.26]
- May 18
- Netherlands Indian Volksraad installed in Batavia. [1]
- TNT explosion in chemical factory in Oakdale, Pennsylvania, USA kills 200. [1]
- May 20
- The US launches the first electrically-propelled warship (the New Mexico). [1]
- May 21
- US House of Representatives passes amendment allowing women to vote. [1]
- May 23
- King Oil/Shell refinery on Curaçao officially opens. [1]
- May 26
- Georgian Social Democratic Republic declares independence from Russia. [1]
- May 28
- Tatars declare Azerbaijan, in Russian Caucasus, independent. [1]
- June 6
- Battle of Belleau Wood, first US victory of the Great War. [1]
- June 22
- Circus train rammed by troop train kills 68 (Ivanhoe, Illinois, USA). [1]
- A circus train wreck kills 86 and injures 127 near Hammond, Indiana, USA. [5]
- June 27
- German submarine U-84 torpedoes and sinks Union Castle Line's passenger liner Llandovery Castle en route from Halifax, Nova Scotia, Canada, to Liverpool, England. The ship was serving as a hospital ship for Canadian forces. [152.18]
- June 28
- First flight between Hawaiian Islands. [1]
- June 30
- In Richardton, North Dakota, USA, a chondrite meteorite falls striking a building. (It is later found to have sufficient isotope xenon-129 to indicate origin in a supernova before birth of Solar System, 4560 million years ago.) [521] [523.122]
- July 4
- Altar is dedicated at full-scale replica of Stonehenge at Maryhill, Washington, USA. [1]
- July 9
- 101 killed and 171 injured in worst US train wreck, in Nashville, Tennessee, USA. [1]
- July 10
- Russian Soviet Federal Socialist Republic is established. [1]
- July 15
- Second Battle of Marne begins. [1]
- July 16
- Russian tsar Nicholas II, his tsarina and their five children are executed. [1]
- July 18
- US and French forces launch Aisne-Marne offensive. [1]
- July 19
- German armies retreat across Marne River in France. [1]
- July 22
- Lightning kills 504 sheep in Utah's Wasatch National Park. [1]
- July 25
- Race riot in Chester, Pennsylvania, USA (three blacks and two whites killed). [1]
- July 26
- Race riot in Philadelphia, Pennsylvania, USA (three whites and one black killed). [1]
- July 27
- Socony 200, first concrete barge in US, launched to carry oil, in New York. [1]
- August 8
- Six US soldiers are surrounded by Germans in France, Alvin York is given command and shoots 20 Germans and captures 132 more. [1]
- August 11
- Battle of Amiens ends, Allies beat Germans. [1]
- August 13
- Bayerische Motoren Werke AG (BMW) is established as a public company in Germany. [5]
- August 15
- First full length cartoon (The Sinking of the Lusitania). [1]
- US and Russia sever diplomatic ties. [1]
- August 20
- Britain opens offensive on Western front during Great War. [1]
- August 27
- Dr Joseph L Johnson named minister to Liberia. [1]
- September 1
- US troops land in Vladivostok, Siberia. [1]
- September 4
- US troops land in Archangel, Russia. [1]
- September 12
- US forces launch an attack on German-occupied Saint Mihiel. [1]
- September 26
- Meuse-Argonne offensive against Germany. [1]
- September 29
- Allied forces score a decisive breakthrough of the Hindenburg Line. [1]
- October 3
- Boris becomes king of Bulgaria. [1]
- October 8
- Sargeant Alvin York single-handedly kills 25, captures 132 Germans. [1]
- October 12
- First use of iron lung (Boston's Children Hospital). [1]
- Cloquet, Minnesota, USA and 25 other communities destroyed by forest fire, 559 die. [1]
- October 17
- First use of American Code Talkers in World War I, by members of the Choctaq tribe in radio communications. [397.73]
- October 25
- Canadian steamship Princess Sophia hits a reef off Alaska, 398 die. [1]
- October 28
- Czechoslovakia declares independence. [1] [371.88]
- October 30
- Slovakia asks for creation of Czechoslovakian state. [1]
- October 31
- Count Stephen Tisza, Hungarian Prime Minister, is assassinated by soldiers. [1]
- November 1
- 97 die in New York City subway's worst accident. [1]
- November 3
- Austro-Hungarian Empire dissolves. [1]
- November 7
- Goddard demonstrates tube-launched solid propellant rocket. [1]
- United Press reports (erroneously) Great War armistice has been signed. [1]
- November 9
- Bavaria proclaims itself a republic. [1]
- Kaiser Wilhelm II abdicates after German defeat in war. [1]
- The German monarch is discarded by the majority Socialists; Philipp Scheidemann proclaims the German Republic. [474.40]
- November 11
- (0500 hours) Germany signs an armistice agreement with the Allies in a railroad car outside Compiegne, France. [129]
- (1100 hours) The Great War ends, after Germany, the last of the Central Powers, surrenders to the Allies. [1] [129]
- Poland proclaims independence from Russia. [1]
- November 12
- Emperor Karl of Austria-Hungary abdicates, Austria becomes a republic. [1]
- November 14
- Republic of Czechoslovakia created with T.G. Masaryk as President. [1]
- November 16
- Hungarian People's Republic is declared. [1]
- November 18
- Latvia declares independence from Russia. [1]
- December 1
- Danish parliament passes an act to grant Iceland independence. [1]
- December 4
- Kingdom of Serbs, Croats and Slovenes (Yugoslavia) proclaimed. [1]
- U.S. President Woodrow Wilson sails to the peace talks in Versailles, France, becoming the first U.S. president to travel to Europe while in office. [1] [5]
- December 5
- Oil refinery on Curaçao opens. [1]
- December 9
- French troops occupy Mainz, Germany. [1]
- December 13
- US army of occupation crosses the Rhine, enters Germany. [1]
- December 14
- Sidonio Pais, prince of Portugal, is murdered. [1]
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