| January 2 | Royal Bank of Canada takes over Quebec Bank |
| January 8 | Austria-Hungarian troops conquer Forlani Italy |
| January 11 | Guy Bolton and PG Wodehouse's "Have a Heart," premieres in New York City |
| January 17 | U.S. pays Denmark $25 million for Virgin Islands |
| January 19 | Silvertown Essex's ammunition factory explodes; 300 die |
| January 27 | Coen de Koning wins 2nd official 11 cities race (9:53) (record) |
| January 29 | English submarine K13 leaves Gaire Loch |
| January 30 | 1st jazz record recorded (Dark Town Strutters Ball) |
| January 31 | Germany notifies U.S. that U-boats will attack neutral merchant ship |
| February 1 | Admiral Tirpitz announces unlimited submarine war |
| February 3 | U.S. liner Housatonic sunk by German sub and diplomatic relations severed |
| February 4 | Belgium Council of Flanders established |
| February 5 | Congress overrides Wilson's veto, curtailing Asian immigration |
| February 5 | Morosco Theater opens at 217 W 45th St. New York City (demolished 1982) |
| February 5 | Present Mexican constitution adopted |
| February 10 | Johanna Westerdijk installed as Netherlands 1st female professor |
| February 15 | SF Public Library (Main Branch at Civic center) dedicated |
| February 16 | 1st synagogue in 425 years opens in Madrid |
| February 20 | Ammunitions ship explodes in Archangelsk harbor, about 1,500 die |
| February 20 | Kern, Bolton and Wodehouse's musical "Oh, Boy!," premieres in New York City |
| February 21 | British Mendi sinks off Isle of Wight, 627 die |
| February 21 | Train near Chirurcha Romania catches fire and explodes; 100s die |
| February 22 | German Navy torpedoes 7 Dutch ships |
| February 23 | February revolution begins in Russia |
| February 24 | German plan to get Mexican help in WW I exposed (Zimmerman telegram) |
| February 24 | Red Sox sell Smokey Joe Wood, his arm dead at 26, to Cleveland for $15,000 |
| February 24 | Russian revolution breaks out |
| February 26 | 1st Annual fair at Utrecht Harbor (Netherlands) |
| February 28 | AP reports Mexico and Japan will allie with Germany if U.S. enters WW I |
| February 28 | Russian Duma sets up Provisional Committee; workers set up Soviets |
| March 1 | 1st federal land bank chartered |
| March 2 | Jones Act: Puerto Rico territory created, U.S. citizenship granted |
| March 3 | Congress passes 1st excess profits tax on corporations |
| March 3 | Great monarch Michael resigns after 1 day as czar |
| March 3 | Nicholas II, last Russian tsar, abdicates (OS) |
| March 5 | 1st jazz recording for Victor Records released |
| March 7 | 1st jazz record "Dixie Jazz Band One Step," recorded by Nick LaRocca Original Dixieland Jazz Band, released by RCA Victor in Camden NJ |
| March 8 | Russian revolution breaks out in Petrograd |
| March 11 | 1st NHL championship game ever played, Toronto Arenas beats Montreal Canadiens 7-3 in 1st of 2 game set (second game on March 13) |
| March 11 | British troops occupy Baghdad |
| March 12 | Russian Dumas sets up Provisional Committee; workers set up Soviets |
| March 12 | Stalin, Kamenev and Muranov arrives in St. Petersburg |
| March 15 | Nicholas II, last Russian tsar, says he will abdicate |
| March 17 | 1st exclusively women's bowling tournament begins in St. Louis |
| March 17 | Tsar Nicolas II of Russia abdicates the throne |
| March 19 | U.S. Supreme Court upheld 8-hr work day for railroad employees |
| March 21 | 1st female U.S. Navy Petty Officer is Loretta Walsh |
| March 23 | Tornadoes kills 211 over 4 days in Midwest U.S. |
| March 26 | Stanley Cup: Seattle Metropolitans (PCHA) beat Montreal Canadiens (NHL), 3 games to 1 - Seattle is 1st U.S. team to win Stanley Cup |
| March 28 | Jews are expelled from Tel Aviv and Jaffa by Turkish authorities |
| March 28 | Puccini's "La Rondine," premieres in Monte Carlo |
| March 31 | U.S. purchases Danish West Indies for $25M and renames them Virgin Islands |
| April 2 | Jeannette Rankin becomes 1st women member of U.S. House of Representatives |
| April 2 | President Wilson asks Congress to declare war against Germany |
| April 3 | Lenin leaves Switzerland for Petrograd |
| April 6 | U.S. declares war on Germany, enters World War I |
| April 7 | De Falla's ballet "El Sombrero de tres Picos," premieres in Madrid |
| April 7 | James Barries' "Old Lady Shows Her," premieres in London |
| April 9 | Battle of Arras begins |
| April 9 | Vimy Ridge France stormed by Canadian troops |
| April 10 | Munition factory explosion at Eddystone PA, kills 133 workers |
| April 11 | Babe Ruth beats New York Yankees, pitching 3-hit 10-3 win for Red Sox |
| April 12 | Bijou Theater opens at 222 W 45th St. New York City (Demolished 1982) |
| April 12 | Domenico Scarlatti and Jeab Cocteaus ballet premieres in Rome |
| April 14 | Chicago White Sox Ed Cicotte no-hits St. Louis Browns, 11-0 |
| April 16 | Lenin returns to Russia to start Bolshevik Revolution |
| April 19 | 21st Boston Marathon won by Bill Kennedy of New York in 2:28:37.2 |
| April 20 | Pravda (Lenin names Russia "Free land of world") |
| April 24 | Yankee lefty George Mogridge no-hits Red Sox 2-1 at Fenway |
| May 2 | Cincinnati Fred Tooney and Chicagos's Hippo Vaughn pitch duel no-hitter, Vaughn gives up 2 hits and a run in 10th, so Cincinnati wins 1-0 |
| May 3 | 1st performance of Ernest Bloch's symphony "Israel" |
| May 4 | Arabs sack Tel Aviv |
| May 5 | St. Louis Brown Ernie Koob no-hits Chicago White Sox, 1-0 |
| May 6 | St. Louis Brown Bob Groom no-hits Chicago White Sox, 3-0 |
| May 7 | Red Sox Babe Ruth beats Washington Senator Walter Johnson, 1-0 |
| May 10 | Atlantic ships get destroyer escorts to stop German attacks |
| May 11 | Britain grants Royal Letters Patent to New Zealand |
| May 12 | 42nd Preakness: E Haynes aboard Kalitan wins in 1:54.4 |
| May 12 | 43rd Kentucky Derby: Charles Borel on Omar Khayyam wins in 2:04.6 |
| May 13 | 1st appearance of Mary to 3 shepherd children in Fatima, Portugal |
| May 13 | Ernest Bloch's "Schelomo," premieres |
| May 18 | Satie/Massine/Picasso's ballet "Parade," premieres in Paris |
| May 18 | U.S. passes Selective Service act |
| May 20 | Turkish government authorizes Jews to return to Tel Aviv and Jaffa |
| May 21 | Leo Pinckney, 1st American drafted during WW I |
| May 23 | Dutch 2nd Chamber okays 1908 conscription draft |
| May 26 | Walt Cruise hit 1st HR out of Braves Field |
| May 27 | Race riot in East St. Louis Illinois, 1 black killed |
| May 31 | 1st jazz record released (Dark Town Strutters Ball) |
| June 1 | Hank Gowdy is 1st baseball player to enlist during WW I |
| June 4 | 1st Pulitzer prize awarded to Richards and Elliott (Julia Ward Howe) |
| June 4 | American men begin registering for the draft |
| June 4 | Order of British Empire inaugurated |
| June 5 | 10 million U.S. men begin registering for draft in WW I |
| June 8 | Walt Disney graduates from Benton High School |
| June 10 | 60,000 people of Petrograd welcome Prince Kropotkin, banned 41 years |
| June 10 | Limburgse mine workers strike |
| June 12 | Secret Service extends protection of president to his family |
| June 13 | Germany bombs London |
| June 14 | 1e German air attack on England, 100+ killed in East-London |
| June 14 | General Pershing and his HQ staff arrived in Paris during WW I |
| June 16 | 1st Congress of Soviets convene in Russia |
| June 16 | 49th Belmont: James Butwell aboard Hourless wins in 2:17.8 |
| June 17 | British king George V takes the name Windsor |
| June 19 | After WW I King George V ordered members of British royal family to dispense with German titles and surnames, they take the name Windsor |
| June 21 | Hawaiian Red Cross forms |
| June 23 | 31st U.S. Womens Tennis: Molla Mallory beat Marion Vanderhoef (46 60 62) |
| June 23 | Ammunition factory in Boleweg Bohemia explodes, killing 1,000 |
| June 23 | Ernie Shore replaces Red Sox pitcher Babe Ruth with a runner on, he throws him out and retires all 26 he faces for a perfect game |
| June 24 | Russian Black Sea fleet mutiny at Sebastopol |
| June 26 | 1st U.S. Expeditionary Force arrive in France during WW I |
| June 27 | 1st baseball player (Hank Gowdy) to enter WW I military service |
| June 28 | Potato entrepreneurs begins in Amsterdam |
| June 28 | Raggedy Ann doll invented |
| July 1 | 257cm-mirror for Mount Wilson Observatory mounted |
| July 1 | Race riots in East St. Louis Illinois (40 to 200 reported killed) |
| July 1 | Reds Fred Toney pitches completes doubleheader victories over Pirates |
| July 1 | Robins (Dodgers) play their 1st Sunday game in Brooklyn |
| July 2 | Riots in East St. Louis Mo |
| July 3 | Spontaneous demonstration at Tauride-palace Petrograd |
| July 6 | T. E. Lawrence captures Port of Agaba from Turkey |
| July 9 | British warship "Vanguard" explodes at Scapa Flow killing 804 |
| July 10 | Emma Goldman imprisoned for obstructing draft |
| July 13 | Vision of Virgin Mary appeared to children of Fatima, Portugal |
| July 17 | British Royal family changes its name from Hanover to Windsor |
| July 20 | Pact of Corfu signed: Serbs, Croats and Slovenes form Yugoslavia |
| July 20 | WW I draft lottery held; #258 is 1st drawn |
| July 22 | Alexander Kerensky becomes Russian PM |
| July 22 | British bomb German lines at Ypres, 4,250,000 grenades |
| July 23 | Cleveland Metropolitan Park District establishes |
| July 26 | J. Edgar Hoover gets job on ministry of Justice |
| July 28 | Silent Parade in New York City to protest murders of blacks in race riots |
| July 30 | Board of Commissioners of Cleveland Metroparks has its 1st meeting |
| July 31 | 3rd battle of Ypres begins |
| August 4 | Pravda calls for killing all capitalists, priests and officers |
| August 5 | British troops attack canal of Ypres in Boesinghe Belgium |
| August 13 | Phillies steal 5 bases in an inning against Braves |
| August 14 | China declares war on Germany and Austria at start of WW I |
| August 14 | Leeuwen soccer team forms |
| August 17 | Italy declares war on Germany and Turkey |
| August 18 | Dutch Naval Air Force forms (MLD) |
| August 19 | Sunday benefit baseball game at Polo Grounds results in John McGraw and Christy Mathewson's arrest for violating Blue laws |
| August 22 | Pittsburgh Pirates play 4th straight extra inning game, Carson Bigbee sets record of 11 at-bats, they lose in 22 innings to Dodgers |
| August 23 | Race riot in Houston Texas (2 blacks and 11 whites killed) |
| August 25 | 37th U.S. Mens Tennis: R Lindley Murray beats N W Niles (57 86 63 63) |
| August 27 | Indians set club record by stealing eight bases in a game |
| August 28 | 10 suffragists arrested as they picket White House |
| September 2 | Deutsche Vaterlands Party forms (by Admiral Tirpitz) |
| September 3 | 1st night bombing of London by German fighter planes |
| September 3 | German troops over run Riga Latvia |
| September 3 | Grover Cleveland Alexander pitches complete wins in a doubleheader |
| September 3 | Utrecht soccer team Holland forms |
| September 6 | French pilot Georges Guynemer shoots down 54th German aircraft |
| September 14 | Kerenski regime declares Russian republic |
| September 14 | Provisional government of Russia forms, Republic proclaimed |
| September 15 | Russia proclaimed a republic by Alexander Kerensky |
| September 20 | British assault on Polygon-forest, France |
| September 26 | British assault on Menin-street, France |
| September 27 | Broadhurst Theater opens at 235 W 44th St. New York City |
| September 27 | EHC soccer team forms in Hoensbroek, Netherlands |
| October 4 | British assault on Broodseinde, France |
| October 8 | Trotski named chairman of Petrograd Soviet |
| October 10 | Giants Rube Benton is 1st lefty to pitch a World Series no hitter |
| October 10 | Plymouth Theater opens at 236 W 45th St. New York City |
| October 13 | Soviet accept establishment of Petrograd Military |
| October 15 | Chicago White Sox beat New York Giants, 4 games to 2 in 14th World Series |
| October 17 | 1st British bombing of Germany |
| October 21 | 1st Americans to see action on front lines of WW I |
| October 21 | Petrograds garrison accepts Revolutionary Military Committee |
| October 23 | 1st Infantry division "Big Red One" shoots 1st U.S. shot in WW I |
| October 23 | Lenin speaks against Kamenev, Kollontai, Stalin and Trotsky |
| October 24 | Battle at Caporetto: German and Austria smash Italian army |
| October 25 | In Russia, Bolsheviks led by Vladimir Lenin seizes power |
| October 25 | Pan-Russian Congress opens in Petrograd |
| October 26 | Petrograd Soviet accepts establishment of Military |
| October 30 | British government gives final approval to Balfour Declaration |
| October 31 | Eugene O'Neill's "In the Zone," premieres in New York City |
| November 1 | In WW I, the 1st U.S. soldiers are killed in combat |
| November 2 | 1st U.S. soldiers killed in combat in WW I |
| November 2 | Balfour Declaration proclaims support for a Jewish state in Palestine |
| November 2 | Lansing-Ishii Agreement; U.S. recognizes Japan's privileges in China |
| November 3 | 1st class mail now costs 3 cents per ounce |
| November 5 | General Pershing and U.S. troops see action on Western Front for 1st time |
| November 5 | Supreme Court decision (Buchanan vs. Warley) strikes down Lousiville Kentucky ordiance requiring blacks and whites to live in separate areas |
| November 6 | Bolshevik revolution begins with capture of Winter Palace |
| November 6 | New York state allows women to vote |
| November 7 | British capture Gaza Palestine from Turks |
| November 7 | October Revolution (Oct 26 OS) in Russia, Lenin seizes power |
| November 8 | People's Commissars gives authority to Lenin, Trotsky and Stalin |
| November 8 | Telephone Co runs 1st ad for Army operators, gets 7,000 applicants |
| November 10 | 41 suffragists are arrested in front of White House |
| November 10 | Faure's 2nd Violo Sonate, premieres |
| November 10 | New soviet government suspends freedom of press (temporary) |
| November 16 | British occupy Tel Aviv and Jaffa |
| November 17 | Lenin defended "temporary" removal of freedom of the press |
| November 20 | 1st tank battle (Britain breaks through German lines) |
| November 20 | Ukrainian Republic declared |
| November 21 | M Gorki calls Lenin a blind fanatic/unthinking adventurer |
| November 22 | NHL forms with Montreal Canadiens, Montreal Maroons, Toronto Arenas, Ottawa Senators and Quebec Bulldogs; National Hockey Association disbands |
| November 28 | Sigmund Rombergs revue "Over the Top," premieres in New York City |
| December 1 | Boys Town founded by Father Edward Flanagan west of Omaha Neb |
| December 2 | Han Yong-woon, found Zen awakening at Osean Monastery Korea |
| December 6 | Finland declares independence from Russia (National Day) |
| December 6 | French munition ship "Mont Blanc" explodes in Halifax, kills 1,700 |
| December 7 | U.S. becomes 13th country to declare war on Austria during World War I |
| December 9 | British forces under General Allenby capture Jerusalem |
| December 11 | 13 black soldiers hanged for alleged participation in Houston riot |
| December 11 | German-occupied Lithuania proclaims independence from Russia |
| December 12 | French troop train derails in French Alps killing 543 |
| December 12 | Reverend Edward Flanagan forms Boys Town outside Omaha, Neb |
| December 14 | UFA, Universal Film AG, forms in Germany |
| December 15 | Moldavian Republic declares independence from Russia |
| December 18 | Soviet regiment (Stalin/Lenin) declares Finland Independent |
| December 19 | 1st NHL game played on artificial ice (Toronto) |
| December 19 | Quebec Bulldogs play their 1st professional hockey game |
| December 20 | Russian secret police in Czechoslovakia forms under Felix Dzerzjinski |
| December 22 | Flanders declares it's independence, under Pieter Tack |
| December 23 | 3 British warships come close to Holland |
| December 25 | Hirsch/Harbach's musical "Going Up," premieres in New York City |
| December 25 | "Why Marry," 1st drama to win Pulitzer Prize, premieres in New York City |
| December 26 | 1st NHL defensemen to score a goal: Toronto Maple Leaf Harry Cameron |
| December 26 | Federal government took over operation of American RR for duration of WW I |
| December 30 | -32 degrees F (-36 degrees C) in Mountain City, Tennessee (state record) |
| December 30 | -37 degrees F (-38 degrees C) in Lewisburg, WV (state record) |
| December 31 | Dutch Social-democratic trade union NVV counts 159,450 members |
