D.W. Griffith's The Birth of a Nation (1915) — based on the novel The Clansman by Thomas Dixon Jr. — was the first major American feature film, a technical achievement that established the grammar of cinematic storytelling. It was also a work of explicit racial propaganda: it portrayed Black men as brutish sexual predators threatening white womanhood, Black politicians during Reconstruction as corrupt buffoons, and the Ku Klux Klan as heroic saviors of civilization. The film's villain, Gus, pursues a white girl until she leaps off a cliff to preserve her virtue. The Klan rides to the rescue.
President Woodrow Wilson screened the film at the White House on February 18, 1915, making it the first film shown in the White House. Wilson, a Virginia-born segregationist who had re-segregated the federal government after taking office in 1913, reportedly said afterward: "It is like writing history with lightning. And my only regret is that it is all so terribly true." (Wilson's defenders have disputed whether he said this; that he screened the film and praised Griffith's work is documented.) The film was used as a recruiting tool by William Joseph Simmons when he refounded the Ku Klux Klan at Stone Mountain, Georgia in November 1915, nine months after the film's release.
The Klan grew from approximately 3,000 members in 1915 to a peak of 3–6 million members by 1924 — the second Klan, which was national rather than Southern, and which included governors, senators, congressmen, and a Supreme Court justice. The NAACP opposed the film from its premiere, organizing boycotts and protests in dozens of cities. Several cities banned the film; most did not. It ran to packed houses for years. Its imagery — Black male sexuality as threat to white civilization, white vigilante violence as civic virtue — entered the mainstream of American popular culture.