The 1st SW film was inducted into the national film registry in its first year of opening as being "culturally, historically, or aesthetically significant"; at the time, it was the newest film to be selected, and it was the only film from the 1970s to be chosen. And its soundtrack was inducted into the national recording registry. It won 7 oscars and it held the record for the highest grossing movie ever for almost a decade. Plus it has some of the most iconic characters to ever grace the silver screen; I mean R2D2, Darth Vader and Princess Leia > Hermoine, Ron and Harry
And that's just one movie
The original Star Wars > All HP movies combined; critics and audiences agree