Which novel helped romanticize the Ku Klux Klan in the early 20th century?

The novel that played a significant role in romanticizing the Ku Klux Klan in the early 20th century is "The Leopard's Spots" by Thomas Dixon Jr. This work, published in 1902, is part of Dixon's trilogy that aimed to promote the idea of Southern honor and the view of the KKK as heroic figures saving the South from perceived threats during the Reconstruction period. The narrative presented the Klan in a heroic light, depicting its members as defenders of white supremacy and Southern values, which contributed to a resurgence of the Klan's popularity in the early 20th century.

In contrast, the other novels mentioned do not fit this historical context. "To Kill a Mockingbird" addresses themes of racial injustice and moral growth, presenting a critical perspective on racism and prejudice. "The Great Gatsby," while an exploration of the American Dream, does not engage directly with themes relevant to the Klan or its ideology. Similarly, "Gone with the Wind" does portray the Civil War and Reconstruction era but focuses more broadly on the Southern experience rather than specifically romanticizing the Klan. Thus, Dixon's work distinctly connects to the promotion of the KKK's narrative during that time.