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Ankh-Morpork Guard said:Star Wars or Jaws...though, technically, neither really 'defines' the 70s, they sure defined movies.
I disagree. I think both define the 70's culture very well. Up until the point both were released, Hollywood viewed people outside of certain areas like LA or NY in very condecending ways. "Why would they watch a movie about a shark" or "No one wants to see a Wookie."
But after they were released, Hollywood took notice and realized that, in most cases, they were wrong. With that, Hollywood allowed other directors to make movies that normally would not have been made. These subsequent movies helped people define themselves and their own culture. Saturday Night Fever for example.
I think both Jaws and Star Wars helped to define the 70's not by their own content, necessarily, but by the movies that they helped bring along that DID define the 70's more specifically.