| January 1 | 1st football game in Rose Bowl, Washington State vs. Brown |
| January 5 | Austria-Hungary offensive against Montenegro |
| January 7 | German troops conquer Fort Vaux at Verdun |
| January 10 | Russian offensive in Kaukasus |
| January 11 | French troops capture/Serbian army flees to Corfu |
| January 12 | Britain proclaims Gilbert and Ellice Is colony in Pacific |
| January 14 | Dutch South Sea dike cracks |
| January 17 | 1st PGA Championship: Jim Barnes at Siwanoy CC Bronxville NY |
| January 17 | Professional Golfer Association (PGA) forms in New York City |
| January 23 | Temp falls from 44 degrees F (7 degrees C) to -56 degrees F (49 degrees C) night of 23-24, Browning, Montana |
| January 25 | Montenegro surrenders to Austria-Hungary |
| January 27 | Communist party "Spartacus Letters" 1st published in Berlin |
| January 28 | 1st Jewish Supreme Court justice, Louis Brandeis, appointed by Wilson |
| January 28 | German colony of Cameroon surrenders to Britain and France |
| January 28 | Opera "Goyescas," premieres (New York City) |
| January 29 | 1st bombings of Paris by German Zeppelins takes place |
| January 31 | Dutch Girl Guides form |
| February 3 | Canada's original Parliament buildings, in Ottawa, burns down |
| February 3 | Tristan Tzar publishes Dada-manifest in Zurich Switzerland |
| February 5 | Enrico Caruso recorded "O Solo Mio" for the Victor Talking Machine Co |
| February 8 | French cruiser "Admiral Charner" torpedoed off Syrian coast, kills 374 |
| February 8 | NL votes down Charlie Ebbets proposal to limit 25 cents seats |
| February 9 | Britain's military service act enforced (conscription) |
| February 9 | NL votes down a proposal by Giants, Braves, and Cubs to increase club player limit from 21 to 22 (The Reds want to decrease to 20) |
| February 10 | Conscription begins in Britain |
| February 11 | Baltimore Symphony Orchestra presents its 1st concert |
| February 11 | Emma Goldman arrested for lecturing on birth control |
| February 12 | 1st edition of Joseph Patterson/Sidney Smith strip "Gumps" |
| February 15 | New York Yankees buy Frank "Home Run" Baker from the Athletics for $37,500 |
| February 16 | Russian troops conquer Erzurum Armenia |
| February 17 | Romberg/Hanley/Atteridge/Smith' musical premieres in New York City |
| February 21 | Battle of Verdun in WW I begins (1 million casualties) |
| February 23 | Congress authorizes McKinley Memorial $1 gold coin |
| February 23 | French artillery kills entire French 72nd division at Samogneux Verdun |
| February 25 | German troops conquer Fort Douaumont near Verdun |
| February 26 | Germans sink French transport ship Provence II, killing 930 |
| February 26 | Mutual signs Charlie Chaplin to a film contract |
| February 26 | Russian troops conquer Kermansjah Persia |
| March 1 | Germany begins attacking ships in the Atlantic |
| March 8 | U.S. invades Cuba for 3rd time, this to end corrupt Menocal regime |
| March 9 | General Fransisco "Poncho" Villa invades U.S. (17 killed) |
| March 9 | Germany declares war against Portugal |
| March 9 | Pancho Villa leads Mexican band raid on Columbus NM, killing 12 |
| March 12 | French airship sinks British submarine D3 |
| March 14 | Battle of Verdun - German attack on Mort-Homme ridge, West of Verdun |
| March 15 | General Pershing, 15,000 troops chasing Villa into Mexico, stays 10-mos |
| March 15 | University of Gent goes under Dutch control |
| March 16 | James Barries' "Kiss for Cinderella," premieres in London |
| March 16 | U.S. and Canada sign migratory bird treaty |
| March 20 | Allies attack Zeebrugge Belgium |
| March 21 | JP Van Limburg Stirum succeeds AWF Idenburg as Governor-General of Netherlands Indies |
| March 25 | Heavyweight Jess Willard and Franc Moran fight to no decision in New York City |
| March 25 | Jess Willard fights Frank Moran to no decision in 10 for boxing title |
| March 25 | Women are allowed to attend a boxing match |
| March 26 | Birdman of Alcatraz receives solitary |
| March 30 | Stanley Cup: Montreal Canadiens (NHA) beat Portland Rosebuds (PCHA), 3 games to 2 |
| March 31 | Dutch government ends all miltary engagements |
| April 1 | 1st U.S. national women's swiming championships held |
| April 2 | German troops overtake Bois de Caillette |
| April 4 | U.S. Senate agrees (82-6) to participate in WW I |
| April 5 | French troops occupy Bois de Caillette |
| April 6 | German parliament OKs unrestricted submarine warfare |
| April 8 | Norway approves active and passive female suffrage |
| April 10 | 1st professional golf tournament held |
| April 19 | 20th Boston Marathon won by Arthur Roth of Mass in 2:27:16.4 |
| April 19 | "Bing Boys are Here" opens in London |
| April 19 | Italians troops conquer Col di Lana at Merano |
| April 20 | German-British sea battle off Belgian coast |
| April 20 | Weeghman Park (Wrigley Field) in Chicago opens, Cubs beat Cincinnati Reds 7-6 |
| April 22 | France battles at Fort Douaumont |
| April 23 | Lord Dunsany's "Night at an Inn," premieres in New York City |
| April 24 | Easter rebellion of Irish against British occupation begins |
| April 29 | Irish nationalists set post office on fire in Dublin |
| April 30 | Chicago Cubs play 1st game at Weeghman Park (Wrigley Field) beat Reds |
| May 2 | 2nd Ave and Bronx Terrace renamed Bronx Blvd; Seward Pl renamed Sycamore Ave; Herald Ave renamed Dickinson Ave; Monroe and Selwyn Avenue named |
| May 2 | U.S. president Wilson signs Harrison Drug Act |
| May 4 | At request of U.S., Germany curtails its submarine warfare |
| May 5 | U.S. Marines invade Dominican Republic, stay until 1924 |
| May 6 | Belgian troop march into Kigali, German East-Africa |
| May 8 | German munitions bunker in Fort Douaumont explodes |
| May 9 | British-France Sykes-Picot meet over division of Turkey |
| May 10 | Disastrous fire in Ellendale, North Dakota |
| May 10 | Historic Shipport Museum opens in Amsterdam |
| May 11 | Einstein's Theory of General Relativity presented |
| May 13 | 1st observance of Indian (Native American) Day |
| May 13 | 42nd Kentucky Derby: Johnny Loftus aboard George Smith wins in 2:04 |
| May 13 | Native American Day is 1st observed |
| May 15 | Asiago Italy falls when Austrian troops attack the Italian front |
| May 16 | 41st Preakness: Linus McAtee aboard Damrosch wins in 1:54.8 |
| May 17 | British Summer Time (Daylight Savings), 1st introduced |
| May 18 | U.S. pilot Kiffin Rockwell shoots down German aircraft |
| May 19 | Escadrille Americaine (Lafayette) transfered to Verdun |
| May 20 | Codell, Kansas hit by tornado (also on same date in 1917 and 1918) |
| May 20 | Saturday Evening Post cover features Norman Rockwell painting |
| May 21 | Britain begins "Summer Time" (Daylight Savings Time) |
| May 22 | French troops occupy parts of Fort Douaumont Verdun |
| May 23 | Heavy battles at Fort Douaumont Verdun |
| May 24 | Conscription begins in Britain |
| May 24 | French driven out of Fort Douaumont after 500 killed or injured |
| May 24 | Last British-Indian contract workers arrive in Suriname |
| May 24 | U.S. pilot William Thaw shoots down a German Fokker |
| May 27 | Groundbreaking begins on Hugh Grant Circle in Bronx |
| May 29 | New York Giants win 17th consecutive road game |
| May 29 | Official flag of president of U.S. adopted |
| May 29 | U.S. forces invade Dominican Republic, stay until 1924 |
| May 31 | Battle of Skagerrak: Brit-German sea battle at Jutland (10,000 dead) |
| May 31 | British battle cruiser Invincible explodes, killing all but 6 |
| June 1 | German attack on Fort Vaux, Verdun |
| June 2 | German troops under Lt Rackow take Fort Vaux |
| June 3 | National Defense Act establishes ROTC |
| June 4 | Russian General Brusilov fails on his Eastern Front attack |
| June 6 | Voters in East Cleveland approves women suffrage |
| June 7 | Germany troop march into Fort Faux, Verdun |
| June 10 | 48th Belmont: E Haynes aboard Friar Rock wins in 2:22 |
| June 10 | Great Arab Revolt begin |
| June 12 | 30th U.S. Womens Tennis: Molla B Mallory beats Louise Raymond (60 61) |
| June 12 | Tennis legend Bill Tilden's 1st appearance at U.S. tennis championship |
| June 15 | Boys Scouts of America forms |
| June 16 | Boston Brave's Tom Hughes 2nd no-hitter beats Pitts, 2-0 |
| June 17 | 1st national congress of Sarekat Islam at Bandoeng Java |
| June 17 | U.S. troops under General Pershing march into Mexico |
| June 18 | Yankees score in every inning but 8th beat Indians 19-3 |
| June 21 | Boston Rube Forster no-hits New York Yankees, 2-0 |
| June 21 | Mexican troops beat U.S. expeditionary force under General Pershing |
| June 25 | Tsar Nicolaas II fires minister of Foreign affairs Sasonov |
| June 26 | Cleveland Indians experiment with #s on their jerseys (one game) |
| June 29 | Boeing aircraft flies for 1st time |
| June 30 | 22nd U.S. Golf Open: Chick Evans shoots a 286 at Minikahda Club MINN |
| June 30 | General Douglas Haig reports "The men are in splendid spirits" |
| July 1 | Battle on the Somme: British 4th Army walks to German lines |
| July 1 | British court martial (Easter uprising) |
| July 1 | Coca-Cola brings current coke formula to the market |
| July 1 | Dwight Eisenhower marries Mary 'Mamie' Geneva Doud in Denver. Colorado |
| July 1 | Honus Wagner, 42, is oldest to hit an inside-the-park home run |
| July 2 | Lenin says Imperialism is caused by capitalism |
| July 2 | Russian offensive in Armenia |
| July 3 | 1st of 3 fatal shark attacks occurred near New Jersey shore (4 die) |
| July 9 | 1st cargo submarine to cross Atlantic arrives in U.S. from Germany |
| July 11 | 1st federal grant-in-aid for state roads enacted |
| July 11 | Congress passes Federal Aid Road Act |
| July 14 | 33.6 cm rainfall at Effingham South Carolina (state record) |
| July 14 | St. Louis Brown Ernie Koob pitches all 17 inns in a 0-0 tie vs Boston |
| July 15 | 22.22" (56.4 cm) of rain falls in Altapass North Carolina (state record) |
| July 15 | Boeing Co (Pacific Aero) formed by William Boeing in Seattle Wash |
| July 20 | Giants trade Christy Mathewson to Cincinnati Reds |
| July 22 | A bomb went off during a Preparedness Day parade in San Francisco killing 10 |
| July 25 | Explosion at Lake Erie and Cleveland Waterworks |
| July 29 | Postal check and Girodienst establishes |
| July 30 | German saboteurs blow up a munitions plant on Black Tom Island, New Jersey |
| August 1 | Hawaii National Park forms |
| August 4 | Denmark cedes Danish West Indies, including the Virgin Islands, to the U.S. for $25 million |
| August 8 | A's set AL record with 19th consecutive loss on road |
| August 10 | Turks annex Persian city Hamadan from Russia |
| August 12 | Picasso, Max Jacob, Kisling, Ortiz and Paquerette photographed in Paris |
| August 17 | Bulgarian offensive in Macedonia |
| August 23 | Military court of Berlin sentences Karl Liebknecht to 4 years |
| August 25 | Department of Interior forms National Park Service |
| August 26 | Philadelphia A's Bullet Joe Bush no-hits Cleveland, 5-0 |
| August 26 | Yankees turn triple-play beating Browns 10-6 |
| August 27 | Romania declares war on Austria-Hungary |
| August 28 | Germany declares war on Romania |
| August 28 | Italy declares war against Germany during WW I |
| August 29 | Congress creates U.S. Naval reserve |
| August 29 | General Von Hindenburg becomes German Chief of Staff |
| August 29 | Transportship Hsin-Yu and cruiser Hai-Yung collide; 1000 die |
| August 29 | U.S. Congress accept Jones Act: Philippines independence |
| August 29 | Von Hindenburg replaces Von Falkenhayn as German chief of staff |
| August 30 | Boston's Dutch Leonard no-hits St. Louis Browns, 4-0 |
| August 30 | Paul Von Hindenburg becomes chief-of-General-Staff in Germany |
| August 31 | Oscar Asche's musical "Chu Chin Chow," premieres in London |
| September 1 | Bulgaria declares war on Romania |
| September 1 | Keating-Owen Act (child labor banned from interstate commerce) |
| September 3 | Allies turned back Germans in WW I's Battle of Verdun |
| September 4 | Christy Mathewson and Mordecai Brown final baseball game |
| September 5 | 36th U.S. Mens Tennis: R N Williams III beats Johnston (46 64 06 62 64) |
| September 7 | Giants beat Brooklyn 4-1, to launch New York's record 26-game winning streak |
| September 7 | Workmen's Compensation Act passed by Congress |
| September 11 | German troops conquer Kavalla Greece |
| September 14 | Christy Mathewson pitches and wins his final game |
| September 15 | 1st tank used in war, "Little Willies" at Battle of Flors, France |
| September 15 | Britains 1st use of tanks (Battle of Somme) |
| September 17 | 40,000 Amsterdam demonstrators demand general voting right |
| September 19 | 1st landing on Schiphol (Farman F-22 of Soesterberg) |
| September 19 | Belgian troops conquer Tabora, German East Africa |
| September 24 | Indians Marty Kavanaugh, hits AL's 1st pinch-hit grand slam |
| September 26 | Bishop speak against Catholics in trade unions |
| September 27 | 1st Native American Day celebrated, honoring American Indians |
| September 27 | Emperor Lidj Jasu of Ethiopia flees |
| September 30 | Giants lose to Braves 8-3, ends 26 consecutive win streak |
| October 2 | Grover Cleveland Alexander records his 16th shutout of year |
| October 2 | San Diego Zoo founded |
| October 4 | Market Street's "Path of Gold" lit for 1st time |
| October 5 | Soldier Adolf Hitler is injured |
| October 7 | 222 points are scored in a football game between Georgia Tech and Cumberland University of Lebanon, Tennessee |
| October 9 | Babe Ruth begins 29 2/3 scoreless World Series innings |
| October 9 | Babe Ruth pitches and wins longest WS game (14 innings) 2-1 |
| October 10 | In Game 3, Charlie Ebbets becomes the 1st owner to raise the price of World Series grandstand seats to $5-up from $3 |
| October 12 | Boston Red Sox beat Brooklyn Dodgers, 4 games to 1 in 13th World Series |
| October 16 | Dodger manager Wilbert Robinson given $5,000 bonus |
| October 16 | Margaret Sanger opens 1st birth control clinic (46 Amboy St, Bkln) |
| October 16 | T. E. Lawrence meets with Fasal Hoessein |
| October 17 | Dutch women demonstrate for female suffrage |
| October 21 | U.S. Army forms Reserve Officers Training Corps |
| October 24 | Moroccan troops capture Ft. Douaumont |
| October 26 | Margaret Sanger arrested for obscenity (advocating birth control) |
| October 27 | 1st published reference to "jazz" appears (Variety) |
| October 31 | Clare Kummer's "Good Gracious Annabelle," premieres in New York City |
| November 2 | Ft. Vaux, Verdun, reconquered by France |
| November 3 | Treaty establishes British suzerainity over Qatar |
| November 5 | Emperor Wilhelm II and French Jozef I establishes kingdom of Poland |
| November 5 | Second Chamber accept initial impetus to general males/female suffrage |
| November 7 | Grand duke Nikolai Nikolayevich warns czar of uprising |
| November 7 | Jeannette Rankin, Representative-R-Montana 1917 - 1919 and 1941 - 1943, elected 1st woman Representative |
| November 7 | Woodrow Wilson (D) re-elected president |
| November 13 | British offensive at Ancre Belgium |
| November 16 | Eugene O'Neill's "Bound East for Cardiff," premieres in New York City |
| November 16 | I Berlin/V Herbert/H Blossoms musical premieres in New York City |
| November 16 | U.S.S.R. La Satannaya ammunitions factory explodes, killing 1,000 |
| November 18 | General Douglas Haig finally calls off 1st Battle of the Somme in Europe |
| November 26 | Greece declares war on Germany |
| November 28 | 1st (German) air attack on London |
| November 29 | Erwin Rommel marries Lucie "Lu" Mollin |
| November 29 | U.S. declares martial law in Dominican Republic |
| December 2 | Baseballers who are injured now get full pay for duration of contract |
| December 6 | German army under General Mackensen occupies Bucharest |
| December 7 | British government of David Lloyd George forms |
| December 7 | David Lloyd George replaces resigning H H Asquith as British PM |
| December 11 | David Lloyd George forms British war government |
| December 12 | Worst train disaster ever (Modane France-543 killed) |
| December 13 | Avalanche kills 10,000 Austrian and Italian troops in 24 hours in Tyrol |
| December 13 | Esme Stuart Lennox Robinsons premieres in Dublin |
| December 13 | French chief of staff Joffre replaced by Nivelle |
| December 15 | French defeat Germans in WW I Battle of Verdun |
| December 19 | Suriname Bauxite Company forms in Paramaribo |
| December 26 | Joseph Joffre becomes marshal of France |
