- Oct 3 7.8 earthquake shakes Pleasant Valley, Nevada
- Oct 4 Dinosaur National Monument in Colorado & Utah is established
- Oct 5 Bulgaria enters World War I as one of the Central Powers.
- Oct 5 Allies land troops at the northern Greek city of Salonika; Greece is nominally neutral but allows the landing
- Oct 8 Battle of Loos on WWI Western Front ends, German forces contain British attack (85,000 casualties)
- Oct 8 Phillies win their 1st & only World Series game before 1980, beating Red Sox, 3-1, with an 8th inning 2 run rally
- Oct 9 Belgrade, Serbia, surrenders to Central leaders
- Oct 9 Gil Anderson races auto (165.1 km record) in Sheepshead Bay, New York
- Oct 9 Louis Kaufmans comedy "Unchastened Woman" premieres in New York City
Event of Interest
Oct 9 Woodrow Wilson becomes first US President to attend a World Series game
Woodrow Wilson
Model T
Oct 12 Ford Motor Company under Henry Ford manufactures its 1 millionth automobile at the River Rouge plant in Detroit
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Event of Interest
Oct 12 Theodore Roosevelt criticizes US citizens who identify themselves with dual nationalities
Theodore Roosevelt
- Oct 13 Boston Red Sox beat Philadelphia Phillies, 4 games to 1 in 12th World Series
- Oct 16 Great Britain declares war on Bulgaria
- Oct 18 3rd Italian offensive at Isonzo
- Oct 19 Russia and Italy declare war on Bulgaria
- Oct 19 US bankers arrange a $500 million loan to the British and French
- Oct 21 1st transatlantic radiotelephone message, Arlington, Va to Paris
Event of Interest
Oct 21 William Jennings Bryan's successor as US Secretary of State, Robert Lansing, sends a note to Britain protesting interference with US shipping
William Jennings Bryan
- Oct 23 1st national horseshoe throwing championship (Kellerton, Iowa)
Women's Suffrage March on Fifth Ave, New York
Oct 23 An estimated 25,000 supporters in a women's suffrage march on New York's Fifth Ave, led by Dr. Anna Shaw and Carrie Chapman Catt, founder of the League of Women Voters
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- Oct 25 James L Curtis named US Minister for Liberia
- Oct 27 Andrew Fisher is replaced as Labour Prime Minister by William 'Billy' Hughes, who will advocate a more active role for Australians in the war
- Oct 28 Richard Strauss' Alpensymfonie, premieres in Berlin
- Oct 29 Aristide Briand becomes Prime Minister of France for the 3rd time
Event of Interest
Oct 29 Tomáš Masaryk claims independence for Czechoslovakia
Tomáš Garrigue Masaryk