1915 – Bulgaria enters World War I as one of the Central Powers.
1915 – Allies land troops at the northern Greek city of Salonika; Greece is nominally neutral but allows the landing
1923 – Edwin Hubble identifies Cepheid variable star
1945 – Hollywood Black Friday: A six month strike by Hollywood set decorators turns into a bloody riot at the gates of Warner Brothers’ studios.
1949 – Sportswriter Robert Ruark first reports golfing great Bobby Jones’s rare spinal disease (syringomyelia) which prevent him from playing any form of golf again
1975 – Austrian Niki Lauda wins the United States Grand Prix at Watkins Glen to claim his first Formula 1 World Drivers Championship; wins by 19.5 points from Emerson Fittipaldi of Brazil
1990 – Pittsburgh Penguins left wing Kevin Stevens has 2 goals and 4 assists in 7-4 opening-night win against the Washington Capitals at Capital Centre to set NHL record for most points in a season opener (6)
1990 – “Henry and June” film, based on the book by Anaïs Nin, first film to be given an NC-17 rating in the US, released
1993 – China performs nuclear test at Lop Nor, PRC
2017 – Spanish constitutional court suspends Catalan parliament to prevent declaration of independence