1910
Events
January
- January 6 – Abé people in the French West Africa colony of Côte d'Ivoire rise against the colonial administration; the rebellion is brutally suppressed by the military.
- January 8 – Treaty of Punakha: The Himalayan kingdom of Bhutan becomes a protectorate of the British Empire.
- January 11 – Charcot Island is discovered by the Antarctic expedition led by French explorer Jean-Baptiste Charcot on the ship Pourquoi Pas? Charcot returns from his expedition on February 11.
- January 12 – Great January Comet of 1910 first observed.
- January 15 – Amidst the constitutional crisis caused by the House of Lords rejecting the People's Budget the January 1910 United Kingdom general election is held resulting in a hung parliament with neither Liberals nor Conservatives gaining a majority.
- January 21 – The Great Flood of Paris begins when the Seine overflows its banks.
- January 22 – Completion of construction of New York City's Metropolitan Life Insurance Company Tower, at the world's tallest building at this time, is celebrated.
- January 31
- * A coal mine explosion at the Colorado Fuel and Iron Company in Primero, Colorado, kills 75 miners.
- * American-born medical practitioner Hawley Harvey Crippen poisons his wife, Cora, and buries her body in the cellar of their London home.
February
- February 1 – A coal mine explosion at the Browder Coal Company in Drakesboro, Kentucky kills 34 miners.
- February 2 – A coal mine explosion at the Palau mine at Las Esperanzas in the State of Coahuila in Mexico kills 68 miners.
- February 5 – A coal mine explosion at the Jefferson Clearfield Coal Company mine at Ernest, Pennsylvania, kills 11 miners but another 110 are able to escape.
- February 8 – The Boy Scouts of America youth organization is incorporated by publisher, adventurer and philanthropist William D. Boyce.
- February 9 – French liner General Chanzy sinks in the Mediterranean after striking rocks off Menorca, with only one survivor of the 157 on board.
- February 12 – Chinese expedition to Tibet: A force of 2,000 Chinese troops march into Lhasa, the capital of Tibet; the 13th Dalai Lama, Thubten Gyatso, is forced to flee to British India.
- February 13 – The strike, begun on November 23, 1909, by 20,000 women against New York City's shirtwaist factories ends after 339 manufacturers agree to a reduced workweek, increased wages and labor union recognition.
- February 20 – Boutros Ghali, the first native-born Prime Minister of Egypt, is assassinated in Cairo.
- March – Albanian revolt of 1910: An uprising against Ottoman rule breaks out in Albania.
- March 1 – The Wellington, Washington avalanche sweeps away two Great Northern Railway passenger trains in the Cascade Mountains, killing 96, making it the worst snowslide accident in United States history.
- March 3 – Morocco signs accords with France in Paris, permitting the French to occupy Casablanca and Oujda in return for military training, as part of refinancing of loans.
- March 4 – The Rogers Pass avalanche buries a group of Canadian Pacific Railway workers clearing tracks in the Selkirk Mountains at Rogers Pass, making it the worst snowslide accident in Canadian history.
- March 8 – In France, Raymonde de Laroche is awarded Pilot's license No. 36 by the Federation Aeronautique Internationale, becoming the first woman authorized to fly an airplane.
- March 10
- * Slavery in China, which has existed since the Shang dynasty, is now made illegal.
- * Nazareth Baptist Church, an African-initiated church, is founded by Prophet Isaiah Shembe in South Africa.
- * Release of In Old California, the first film made in Hollywood, California, directed by D. W. Griffith.
- March 12 – American actress Florence Lawrence becomes "the first true movie star" after being named in advertisements, having previously been billed only as "The Biograph Girl".
- March 17 – Progressive Republicans in the United States House of Representatives rebel against Speaker Joseph Gurney Cannon, removing him from the Rules Committee and stripping him of his power to appoint committee chairmen.
- March 18 – The first filmed version of Mary Shelley's Frankenstein comes out. Considered to be the first horror movie, it stars actor Charles Ogle as the monster.
- March 20 – The first clinic for treatment of occupational diseases is opened in Milan.
- March 22 – President of the United States William H. Taft gives an American endorsement in favor of creating a "World Court" for the resolution of disputes between nations.
- March 23 – A rebellion by Rif tribesmen in Spanish Morocco is finally suppressed after 8 months. During the conflict, an estimated 8,000 Berbers and 2,000 Spanish soldiers have been killed.
- March 27 – A fire during a barn-dance in Ököritófülpös, Hungary, kills 312 people after ballroom decorations catch alight.
April
- April 5 – The Transandine Railway connecting Chile and Argentina is inaugurated.
- April 10 – Halley's Comet becomes visible with the naked eye ; Earth passes through its tail about May 19.
May
- May 6 – George V becomes King of the United Kingdom of Great Britain and Ireland upon the death of his father, Edward VII.
- May 12 – The second National Association for the Advancement of Colored People meeting is held in New York City.
- May 31 – The Union of South Africa is created.
June
- June 2 – Charles Rolls became the first person to fly across the English Channel and back without stopping.
- June 3 – The Norwegian Antarctic Expedition, led by Roald Amundsen on the steamer Fram, departs from Christiania without fanfare, and no announcement until later in the year of Amundsen's intention to reach the South Pole.
- June 5 – The Nanyang industrial exposition, an official world's fair, opens in Qing dynasty China.
- June 6 – The Holland Dakota Landbouw Compagnie is established.
- June 14–23 – Edinburgh Missionary Conference is held in Scotland, presided over by John Mott, launching the modern ecumenical movement and the modern missions movement.
- June 15 – The British Antarctic Expedition, led by Robert Falcon Scott on the whaler Terra Nova, departs from Cardiff for the South Pole.
- June 22 – DELAG Zeppelin dirigible Deutschland makes the first commercial passenger flight, from Friedrichshafen to Düsseldorf in Germany; the flight takes 9 hours.
- June 25 – The ballet The Firebird, the first major work by Russian composer Igor Stravinsky, commissioned by Diaghilev's Ballets Russes, is premièred in Paris, bringing the composer international fame.
July
- July – First Girl Guide troops registered in the United Kingdom, under the supervision of Agnes Baden-Powell.
- July 4 – African-American boxer Jack Johnson defeats white American boxer James J. Jeffries in a heavyweight boxing match, sparking race riots across the United States.
- July 9–10 – 'Fowler's match': the Eton v Harrow cricket match at Lord's ground in London, known after the captain of Eton College, Robert St Leger Fowler, and described as "what might just be the greatest cricket match of all time".
- July 11 – Departure for France of Amenokal Moussa Ag Amastan as part of the Tuareg mission.
- July 12 – Charles Rolls becomes the first British aviation fatality when his French-built Wright aeroplane suffers a broken rudder at an altitude of and crashes during a contest at Bournemouth.
- July 22 – A wireless telegraph sent from the results in the identification, arrest and execution of murderer Dr. Crippen.
- July 24 – Ottoman forces capture the city of Shkodër to put down the Albanian Revolt of 1910.
- August – The International Commercial Bureau of the American Republics becomes the Pan-American Union.
- August 14 – A fire at the Brussels International 1910 world's fair destroys exhibitions of Britain and France.
- August 20 – The Great Fire of 1910, a wildfire that burns 4,700 square miles in the Inland Northwest of the United States, due to dry weather.
- August 22 – The Japan–Korea Treaty of 1910, by which the Empire of Japan formally annexes the Korean Empire, is signed.
- August 28 – Montenegro is proclaimed an independent kingdom, under Nicholas I.
- August 29 – Emperor Sunjong of Korea abdicates and the country's monarchy is abolished.
- August 31 – Gafanha da Nazaré is founded by Prior Sardo and becomes the last Portuguese town to receive a foral from the monarchy, granted by King Manuel II.
September
- September 1
- * The Vatican introduces a compulsory oath against modernism, to be taken by all priests upon ordination.
- * Sport Club Corinthians Paulista is founded in Brazil by railwaymen; its Association football team will be the first FIFA Club World Cup champions in 2000.
- October
- * Infrared photographs are first published by Professor Robert Williams Wood, in the Royal Photographic Society's journal.
- * Approximate date of origin of Manchurian plague, a form of pneumonic plague which by December is spreading through northeastern China, killing more than 40,000.
- October 5 – 5 October 1910 revolution: The First Portuguese Republic is proclaimed in Lisbon; King Manuel II of Portugal flees to England.
- October 7 – Baudette fire of 1910, a wildfire that burns ca. 350,000 square miles in Minnesota and Ontario, including several towns.
- October 18 – The lake freighter SS William C. Moreland runs aground on a reef near the Keweenaw Peninsula in Lake Superior, leading to its loss.
- October 20 – The hull of White Star ocean liner is launched, at the Harland and Wolff shipyards in Belfast.
- October 23
- * Vajiravudh is crowned King of Siam, after the death of his father, King Chulalongkorn.
- * The Philadelphia Athletics defeat the Chicago Cubs, 7–2, to win the 1910 World Series in baseball in Game 5.