The book's immense popularity led Baum to write thirteen sequels, including The Marvelous Land of Oz (1904), Ozma of Oz (1907), and The Emerald City of Oz (1910), making the Oz series one of the most enduring works in children's literature. Beyond Oz, Baum wrote prolifically under several pen names, producing titles such as The Life and Adventures of Santa Claus (1902) and the popular Aunt Jane's Nieces series for young readers.
Baum's imaginative storytelling and pioneering contributions to American fantasy secured his place as a foundational figure in children's literature. He died in 1919 in Hollywood, California, yet his magical world of Oz continues to inspire countless adaptations in film, theater, and television, remaining a cherished part of global popular culture.