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The 1910s

2,198 sourced entries across 10 years, inside the 20th century. Each year below opens its own page; the lines under it are that year’s highest-ranked entries.

1910 CE198 entries

  • January 12 – Great January Comet of 1910 first observed (perihelion: January 17).
  • May 6 – George V becomes King of the United Kingdom of Great Britain and Ireland upon the death of his father, Edward VII.
  • October 5 – 5 October 1910 revolution: The First Portuguese Republic is proclaimed in Lisbon; King Manuel II of Portugal flees to England.

1911 CE200 entries

  • March 25 – The Triangle Shirtwaist Factory fire in New York City kills 146 people.
  • April 27 – Huanghuagang Uprising: In China, rebels take five villages in an attempt to create a power base to fight Imperial rule; those who die are remembered as "The 72 Martyrs" (the event is also called the "Second Guangzhou Uprising" and the "Yellow Flower Mound Revolt").
  • September 29 – Italy declares war on the Ottoman Empire over claims in Libya. The Italo-Turkish War would go on until October 18, 1912. The Italian fleet appeared off Tripoli in the evening of September 28, but only began bombarding the port on October 3. The city was conquered by 1,500 sailors, much to the enthusiasm of the interventionist minority in Italy. Another proposal for a diplomatic settlement was rejected by the Italians, and the Turks determined therefore to defend the province. As a result of this conflict, Italy captured Ottoman Tripolitania. These territories together formed what became known as Italian Libya. During the conflict, Italian forces also occupied the Dodecanese islands in the Aegean Sea.

1912 CE200 entries

  • May 5 – The 1912 Summer Olympics open in Stockholm, Sweden. Modern Pentathlon is contested for the first time in these games.
  • December 3 – Bulgaria, Montenegro, and Serbia (the Balkan League, but not Greece) sign an armistice with the Ottoman Empire at Çatalca, temporarily halting the First Balkan War after 2 months. (The armistice will expire on February 3, 1913, and hostilities will resume.)
  • 14–15 April – the sinking of the Titanic: White Star liner RMS Titanic strikes an iceberg and sinks on her maiden voyage from the United Kingdom to the United States.

1913 CE222 entries

  • 4 June – Emily Davison, a suffragette, runs out in front of the King's horse, Anmer, at the Epsom Derby. She is trampled and dies four days later on 8 June, never having regained consciousness.
  • June 15 – Battle of Bud Bagsak in the Philippines concludes with U.S. troops under General John J. Pershing taking Bug Bagsak from defending Moro rebels, killing at least 500.
  • August 11 – The London ambassadors conference, of Europe's six "Great Powers" (Austria-Hungary, France, Germany, Italy, Russia, the United Kingdom), settled on the boundaries of the new Principality of Albania, created from former Turkish territory by the Balkan League during the First Balkan War.

1914 CE239 entries

  • June 28 – Assassination of Archduke Franz Ferdinand of Austria: Serbian nationalist Gavrilo Princip, 19, assassinates Archduke Franz Ferdinand of Austria and his wife, Duchess Sophie, in Sarajevo, Bosnia and Herzegovina, triggering the July Crisis overnight and eventually World War I. Anti-Serb riots in Sarajevo and Zagreb break out.
  • July 25 – Serbia responds to the ultimatum from the 23rd accepting some but not all of Austria-Hungary's demands. In response Austria-Hungary severs diplomatic ties with Serbia and begins to mobilise its own forces. Radomir Putnik, Chief of the Serbian General Staff, is arrested in Budapest, but subsequently allowed to return to Serbia.
  • August 26–27 – Battle of Le Cateau: British, French, and Belgian forces make a successful tactical retreat from the German advance.

1915 CE209 entries

  • February 25 – Armenian genocide: The Ottoman Empire transfers Armenians from its armed forces to unarmed Ottoman labour battalions.
  • April 25 – WWI: Start of the Gallipoli Campaign by land forces (lasting until January 1916) – A landing at Anzac Cove is conducted by Australian and New Zealand Army Corps, and a landing at Cape Helles by British and French troops, to begin the Allied invasion of the Gallipoli peninsula in the Ottoman Empire.
  • 7 May – Sinking of the Lusitania: British ocean liner RMS Lusitania was sunk by Imperial German Navy U-boat U-20 about 11 mi off Old Head of Kinsale, County Cork, killing 1,198 civilians en route from New York to Liverpool, among them the Irish-born art dealer and benefactor Sir Hugh Lane and Irish composer and conductor Thomas O'Brien Butler.

1916 CE224 entries

  • May 31–June 1 – WWI: Battle of Jutland, between the British Royal Navy's Grand Fleet and the Imperial German Navy's High Seas Fleet in the North Sea, the war's only large-scale clash of battleships. The result is tactically inconclusive, but British dominance of the North Sea is maintained
  • July 1–November 18 – WWI: Battle of the Somme, opening with explosion of the British Y Sap and Lochnagar mines and the Battle of Albert: More than one million soldiers die, with 57,470 British Empire casualties on the first day, 19,240 of them killed, the British Army's bloodiest day. The immediate result is tactically inconclusive.
  • August 27 – Romania declares war on Austria-Hungary. The Romanian Army begins an offensive in Transylvania.

1917 CE236 entries

  • February 24 – World War I: United States ambassador to the United Kingdom, Walter H. Page, is shown the intercepted Zimmermann Telegram, in which Germany offers to give Texas, Arizona, and New Mexico back to Mexico if Mexico declares war on the United States.
  • April 16 – WWI: The Nivelle Offensive commences.
  • November 7 – (N.S.) (October 25, O.S.) – October Revolution in Russia: The workers of the Petrograd Soviet in Russia, led by the Bolshevik Party and leader Vladimir Lenin, storm the Winter Palace and successfully destroy the Kerensky Provisional Government after less than eight months of rule. This immediately triggers the Russian Civil War.

1918 CE233 entries

  • June–August – The "Spanish flu" becomes pandemic. Over 30 million people die in the following 6 months.
  • October 28 – Czechoslovakia declares its independence from Austria-Hungary.
  • November 3 – Armistice of Villa Giusti ends warfare between Italy and Austria-Hungary on the Italian Front during World War I. The armistice was signed in the Villa Giusti, outside of Padua in the Veneto, northern Italy, and was to take effect 24 hours later. The occupation of all Tyrol, including Innsbruck, was completed in the following days.

1919 CE237 entries

  • May 19 – Mustafa Kemal Atatürk lands at Samsun on the Anatolian Black Sea coast, marking the start of the Turkish War of Independence. The anniversary of this event is also an official day of Turkish Youth.
  • June 28 – The Treaty of Versailles ends the state of war between Germany and the Allied Powers.
  • July 1 – Russian Civil War: Perm Operation (1918–19) begins on the Siberian Front: The 2nd and 3rd armies of Soviet Russia recapture the city of Perm.