The October Revolution in Russia (October 25th by the Julian calendar; November 7th by the Gregorian calendar).
China declared war on Germany (which had territories there).
The Balfour Declaration supported a Jewish "national home" in Palestine.
Art and Culture
Jazz was officially born when The Original Dixieland Jazz Band recorded Livery Stable Blues.
The French artist Marcel Duchamp showed Fountain, his first "ready-made", in New York.