The Wizard of Oz was shown at The Chicago Grand Opera House for the first time.
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Grease, starring John Travolta and Olivia Newton-John, was released in the US.
The longest papal reign began when Pope Pius IX was elected.
Pepsi Cola became an official trademark.
Henry Ford and 12 investors incorporated the Ford Motor Company in Detroit, Michigan.
Ghostbusters II was released in 2,410 movie theaters across the US.
