- Dec 1 Boston Braves MLB franchise owner James Gaffney buys the Allston Golf Club on Commonwealth Avenue, Boston with a plan to construct a ball park there; ground breaking for Braves Field starts on March 20, 1915
- Dec 3 Gerrit Brinkman becomes 1st Dutch traffic officer
- Dec 3 Turkey, Serbia, Montenegro, Greece & Bulgaria sign weapons pact
- Dec 3 First Balkan War: The Naval Battle of Elli takes place.
- Dec 5 The Triple Alliance among Italy, Austria, and Germany (originally signed in 1882) is renewed for six years, beginning in 1914, a move inspired by instability in the Balkans
- Dec 6 China votes for universal human rights
- Dec 7 Bust of Queen Nefertiti found in El-Amarna, Egypt
- Dec 12 Rudolf Friml and Otto Harbach's musical "Firefly" premieres in New York City
- Dec 16 1st US postage stamp picturing an airplane, 20 cent parcel post, issued
- Dec 16 Austria-Hungary engage in conflict with Serbia
- Dec 16 First Balkan War: The Ottoman Navy is defeated by the Royal Hellenic Navy at the Battle of Eli
- Dec 17 Albania's de facto independence from the Ottoman Empire is recognized at the London Conference of Ambassadors
- Dec 18 Piltdown Man, later discovered to be a hoax, is supposedly found in the Piltdown Gravel Pit, by Charles Dawson.
- Dec 20 J Hartley Manners' "Peg O' My Heart" premieres in NYC
- Dec 20 Paul Claudels "L'Annonce Faite à Marie" premieres in Paris
- Dec 21 Denmark, Norway & Sweden declare neutrality in Comende war
- Dec 23 1st "Keystone Kops" film, entitled "Hoffmeyer's Legacy"
- Dec 23 Aswan Low Dam in Nile begins operation
Dec 23 Indian revolutionary underground in Bengal and Punjab, headed by Rash Behari Bose attempts to assassinate the Viceroy of India, Lord Hardinge by throwing a homemade bomb into the Viceroys's Howdah (elephant carriage) during a ceremonial procession through the streets of Delhi. Although wounded, the Viceroy survives. Investigations lead to the Delhi conspiracy trial.
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