According to the Library of Congress, The Wizard of Oz (from 1939) is the most watched film ever This is due in part to its regular broadcast on network TV beginning in the 1950s.
One interesting collection of insights comes from the writer Salman Rushdie, who shows that The Wizard of Oz has been successful because it embodies some of our most enduring values. At the same time, it also raises some provocative ideas. One prominent theme revolves around the inadequacy of adults—their inability to live up to expectations and to face down the larger forces in life. Adults, especially the good adults, are portrayed as powerless.In the beginning, for example, Auntie Em and Uncle Henry are unable to prevent the wicked Miss Gulch from taking Toto away (after she gets bitten by him). They're also helpless to protect their farm, or to protect Dorothy, from the oncoming tornado. Later, the film's defining moment comes when we learn that the all-powerful Wizard is in fact powerless. These episodes will be disappointing to younger viewers, but they should hardly surprise older viewers, who are well-accustomed to the fallibility of adults. Is the film trying to convey this reality to children too? Another theme centers on the relationship between power and gender. The Wizard of Oz veers from the traditional Hollywood storyline in that there's no male hero. In fact, quite the opposite: the only two figures with any real power are women—Glinda the Good Witch and Miss Gulch/Wicked Witch. The male leads—the Scarecrow, Tin Man, and Cowardly Lion—play the classic "common man" roles, with little power to control their own destiny. The only other powerful character to emerge is Dorothy.In fact, after the struggle over Toto, the tornado can be understood as the clashing forces between Miss Gulch and the headstrong Dorothy. (It's no coincidence that Dorothy's last name is Gale). When we get to Oz, Glinda, Dorothy, and the Witch are the three powerful figures, while all the men are weak (including the Wizard). Thus, similar to the theme about the inadequacy of adults, we're also getting the message that men's power is illusory, whereas women's power is real. Dorothy’s immortal line is considered one of the central messages of the movie. If you ever go looking for your heart's desire, you don't have to look any further than your own back yard. In other words: your roots are important. Although this lesson is played up in the final scene of the film, the bulk of the story is instead about the dream of escaping, the desire to leave the here and now to find a better place. This desire is stirred early when Auntie Em admonishes Dorothy to go "find yourself a place where you won't get into any trouble." Dorothy wonders whether such a place exists, and her rendition of somewhere "Over the Rainbow" provides the answer. And is there any real contest between 1) the gray world of Kansas where there's nothing to do and no one to play with, and 2) a place where you're instantly loved by many (the Munchkins), you have a clear, meaningful goal (to see the wizard), and you have three new friends to help you reach that goal? There's little doubt whether viewers would want to stay in Kansas or escape someplace else. But Dorothy, who's still a child back in Kansas, has little choice but to stay for now. Without any real alternatives, isn't it better to just convince yourself that you're exactly where you want to be? These contrasting values (escaping vs. embracing your roots) broaden the movie's appeal, allowing you to take away whichever message speaks to you more. Or better yet, the two messages can be taken together: Be happy with what you've got, but you can still dream of escaping to a better place. We get a related message from Glinda, when she tells Dorothy that she's had the power to return herself home all along, she just didn't know it. Similarly, the Scarecrow, Tin Man, and Cowardly Lion discover that what they were seeking—a brain, a heart, and some courage—were actually inside of them all along. Overall, the film is affirming that you have the ability to get what you want, and this power comes from within. Other people may be able to offer some moral support, but ultimately it's up to you. One of the more subtle messages of the film is the way it characterizes human nature: people are depicted as generally good. This theme is best expressed when Dorothy accuses the Wizard of being a very bad man for deceiving them, to which he humbly replies, "Oh no, my dear...I'm a very good man. I'm just a very bad wizard." (He's powerless, but good.) Instead, all the evil emanates from the Wicked Witch, who can get others to behave badly while under her spell. Her foot soldiers, for example, turn out to be pretty nice guys once the witch is dead. Our goodness and our strengths come from within ourselves, while our wickedness originates from the outside—in this case by a truly evil person. This view of human nature fits with the current view held by many psychologists, who perceive people as well-intentioned but capable of behaving badly under harsh conditions or cruel authority figures.