Why is May The 4th Called Star Wars Day?

Margaret Thatcher has won the election and become Britain’s first woman prime minister. To celebrate their victory her party took a half page of advertising space in the London Evening News. This message, referring to the day of victory, was ‘May the Fourth Be With You, Maggie. Congratulations,’ further proof of the extent to which Star Wars has influenced us all.
— Alan Arnold, chronicling making of Empire Strikes Back, 1979

I wish the conservative party here in the U.S. was that cool. Oh wait, we are:

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