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Lieutenant Governor of Kansas: Richard Joseph Hopkins (Republican)
Lieutenant Governor of Kentucky: Edward J. McDermott (Democratic)
Lieutenant Governor of Louisiana: vacant (until month and day unknown), Thomas C. Barret (Democratic) (starting month and day unknown)
Lieutenant Governor of Massachusetts: Louis A. Frothingham (Republican) (until month and day unknown), Robert Luce (Republican) (starting month and day unknown)
January 6 – New Mexico is admitted as the 47th U.S. state (seeHistory of New Mexico).
January 11–March 12 – 1912 Lawrence textile strike ("Bread and Roses" strike): Immigrant textile workers in Lawrence, Massachusetts, strike in response to a pay cut corresponding to a new law shortening the working week.
January 22 – The Overseas Railroad opens: the first train arrives in Key West, Florida, at 10:43 a.m. with Henry M. Flagler, the railroad's creator and owner, aboard.
February[]
February 14 – Arizona is admitted as the 48th U.S. state and the last of contiguous states to be admitted into the Union (seeHistory of Arizona).
March[]
March 1 – Albert Berry makes the world's first or second parachute jump from an airplane in flight, at Jefferson Barracks Military Post in Missouri.
March 12 – The Girl Scouts of the USA are founded by Juliette Gordon Low, in Savannah, Georgia.
March 27 – Mayor Yukio Ozaki of Tokyo gives 3,000 cherry blossom trees to be planted in Washington, D.C., to symbolize the friendship between the two countries.
April 18: The Carpathia arrives in New York City with the RMS Titanic survivors.
April[]
April 10 – The British ocean linerRMS Titanic leaves Southampton, England on her maiden voyage for New York City.
April 14–15 – Sinking of the RMS Titanic: RMS Titanic strikes an iceberg in the northern Atlantic Ocean and sinks with the loss of between 1,517 and 1,636 lives. The wreck will not be discovered until 1985.[2]
April 18 – The Cunard liner RMS Carpathia arrives in New York City with Titanic's 706 survivors.
April 19 – The United States Senate initiates an official inquiry into the Titanic disaster, hastily issuing subpoenas for White Star personnel before they can return to the United Kingdom.
May 6 – Suffragettes and their supporters parade in New York City.
May 8 – Adolph Zukor founds Famous Players Film Company, now Paramount Pictures.
May 11 – Alaska is constituted as a territory of the U.S.
May 18 – The Detroit Tigers go on strike to protest the suspension of Ty Cobb. A replacement team recruited from the coaching staff and local colleges is fielded to avoid a forfeiture to the Philadelphia A's in a lopsided loss.
May 30 – Joe Dawson wins the 1912 Indianapolis 500-Mile Race for automobiles (the second held) after Ralph DePalma's Mercedes breaks down within sight of the finish.
June 8 – Carl Laemmle founds Universal Studios as the Universal Film and Manufacturing Company in New York City, moving production to Hollywood by the end of the year
June 9 – The Villisca axe murders take place in Villisca, Iowa
June 18 – The Republican National Convention nominates incumbent President William Howard Taft in Chicago, defeating a challenge by former President Theodore Roosevelt, whose delegates bolt the convention.
June 25 – The Democratic National Convention nominates New Jersey Governor Woodrow Wilson in Baltimore.
July[]
July 1 – Harriet Quimby, who set the record as the first woman to fly the English Channel only 2 months before, dies in Squantum, Massachusetts after her brand-new two-seat Bleriotmonoplane crashes, killing both Quimby and her passenger.
July 19 – A meteorite with an estimated mass of 190 kg explodes over the town of Holbrook in Navajo County, Arizona causing thousands of pieces of debris to rain down on the town.
August[]
August 4 – United States occupation of Nicaragua: U.S. Marines land from the USS Annapolis in Nicaragua, to support the conservative government at its request.[3]
August 5 – Dissident U.S. Republicans form the Progressive Party, also known as the Bull Moose Party, and nominate former President Theodore Roosevelt as their presidential candidate.
August 21 – The first Eagle Scout (Boy Scouts of America) earns his rank.
September[]
September 25 – The Columbia University Graduate School of Journalism is founded in New York City.
September 28 – Composer W. C. Handy publishes his "Southern rag" "The Memphis Blues".
October[]
October 14 – While campaigning in Milwaukee, Wisconsin, former President Theodore Roosevelt is shot by saloonkeeper John Schrank. With a fresh flesh wound and the bullet still in him, Roosevelt delivers his scheduled speech. After finishing it, he goes to the hospital, where it is deduced that if he had not had his speech in his breast pocket when he was shot, he most likely would have died.
October 16 – The Boston Red Sox, assisted by a famous error, defeat the New York Giants in extra innings to win the 1912 World Series in what is considered one of the greatest games of baseball ever played.
October 30 – Vice President James S. Sherman dies of kidney failure just days prior to the U.S. presidential election.
November[]
November 5 – U.S. presidential election, 1912: Democratic challenger and Governor of New JerseyWoodrow Wilson wins a landslide victory over Republican incumbent William Howard Taft. Taft's base is undercut by Progressive Party candidate (and former Republican) Theodore Roosevelt, who finishes second, ahead of Taft.
Undated[]
The American Little Theatre Movement begins with the founding of the Toy Theatre in Boston and the Little Theatre of Chicago.
Remaining residents of Malaga Island, off the coast of Maine, are forcibly evicted.
First Sea Scout groups under the aegis of the Boy Scouts of America established this summer.