The question of how the book traces the development of American film is a challenging one. There are many ways to answer this question, but perhaps the most accurate and detailed response would come from looking at each stage of development in American film history. This can be done by discussing key films, filmmakers, and movements during each time period.
One way to look at the development of American film is through its genres. For example, early films were often Westerns or comedies, while later films experimented with different genres like drama or horror. Another way to trace the development of American film is through specific films that were groundbreaking or highly influential in their time. For example, D.W Griffith's Birth of a Nation was a hugely important film in terms of both its technical innovations and its controversial subject matter. Likewise, Orson Welles' Citizen Kane was another game-changing work that pushed the boundaries of what could be accomplished within the medium.
Ultimately, tracing the development of American film is a complex task that can be approached in many different ways. By looking at specific films, genres, and filmmakers from throughout history, we can get a sense of how this art form has evolved over time - and how it continues to surprise and challenge us today.