President Franklin D. Roosevelt's fireside chats increased public support for which of the following initiatives?

This choice is incorrect as The Birth of a Nation was a silent film that did not utilize recorded sound. While it was innovative in its cinematographic techniques, it did not mark the end of the silent film era, which continued for several more years until the introduction of "talkies."

This is the correct choice, as the film portrayed African Americans as violent and immoral, while simultaneously portraying the Ku Klux Klan as heroic figures. This representation was a major factor in the backlash against the film and sparked debates about racism in American cinema.

This option is incorrect, as The Birth of a Nation was released in 1915, before the U.S. entered the First World War in 1917. The film's content was more focused on the Civil War and Reconstruction era rather than world events occurring at that time.

This choice is incorrect because The Birth of a Nation was, in fact, a commercial success. It was one of the highest-grossing films of its time and earned back its production costs many times over, which contributed to its controversial yet celebrated status in film history.