Editing 1904 (section)

=== December ===
* [[December 2]] – The [[St. Petersburg Soviet]] urges a [[run on the bank]]s; the attempt fails, and the executive committee is arrested.
* [[December 3]] – [[Charles Dillon Perrine]] discovers [[Jupiter]]'s largest [[irregular satellite]], later called [[Himalia (moon)|Himalia]], at California's [[Lick Observatory]].
* [[December 4]] – The K.U. or [[Konservativ Ungdom]] (Young Conservatives) is founded by Carl F. Herman von Rosen in Denmark.
* [[December 6]] – [[Theodore Roosevelt]] announces his [[Roosevelt Corollary|"Corollary"]] to the [[Monroe Doctrine]], stating that the United States will intervene in the Western Hemisphere should Latin American governments prove incapable or unstable.
* [[December 10]] – The [[Pi Kappa Phi]] fraternity is founded at the [[College of Charleston]] in Charleston, South Carolina.
* [[December 27]]
** The stage play ''[[Peter Pan, or the Boy Who Wouldn't Grow Up|Peter Pan, or The Boy Who Wouldn't Grow Up]]'' premieres in London.
** The [[Abbey Theatre]] in [[Dublin]] opens.
* [[December 30]] – The [[East Boston Tunnel]] opens, for [[streetcar]]s.
* [[December 31]] – In New York City, the first [[New Year's Eve]] celebration is held in [[Times Square]].