prominent location. In a 2020 study, South Dakota was ranked as the 22nd hardest state for citizens to vote in. Culture South Dakota's culture reflects the state's American Indian, rural, Western, and European roots. A number of annual events celebrating the state's ethnic and historical heritage take place around the state, such as Days of '76 in Deadwood, Czech Days in Tabor, and the annual St. Patrick's Day and Cinco de Mayo festivities in Sioux Falls. The various tribes hold many annual pow wows at their reservations throughout the state, to which non-Native Americans are sometimes invited. Custer State Park holds an annual Buffalo Roundup, in which volunteers on horseback gather the park's herd of around 1,500 bison. Black Elk (Lakota) was a medicine man and heyokha, whose life spanned the transition to reservations. His accounts of the 19th-century Indian Wars and Ghost Dance movement, and his deep thoughts on personal visions and Native American religion, form the basis of the book Black Elk Speaks, first published in 1932. (Among several editions, a premier annotated edition was published in 2008.) Paul Goble, an award-winning children's book author and illustrator, was based in the Black Hills from 1977. Laura Ingalls Wilder, whose semi-autobiographical books are based on her experiences as a child and young adult on the frontier, is one of South Dakota's best-known writers. She drew from her life growing up on a homestead near De Smet as the basis for five of her novels: By the Shores of Silver Lake, The Long Winter, Little Town on the Prairie, These Happy Golden Years, and The First Four Years. These gained renewed popularity in the United States when Little House on the Prairie was adapted and produced as a television series in 1974. Wilder's daughter, Rose Wilder Lane, who became a well-known writer in her own right, was born near De Smet in 1886. South Dakota has also produced several notable artists. Harvey Dunn grew up on a homestead near Manchester in the late 19th century. While Dunn worked most of his career as a commercial illustrator, his most famous works showed various scenes of frontier life; he completed these near the end of his career. Oscar Howe (Crow) was born on the Crow Creek Indian Reservation and won fame for his watercolor paintings. Howe was one of the first Native American painters to adopt techniques and style heavily influenced by