How do film genres generally tend to originate and develop?

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Film genres tend to originate and develop organically, as they are often inspired by shifts in history, politics, or society. For example, the film noir genre emerged in the aftermath of World War II, reflecting a sense of disillusionment and anxiety in American society. Similarly, the Western genre evolved out of myths and legends of the American frontier, as well as a desire to explore themes of individualism, heroism, and violence. While marketing teams and filmmakers may contribute to the development of genres, they generally do so in response to existing trends and cultural movements.

How Do Film Genres Generally Tend to Originate and Develop