Which North Dakota national park is named after the 26th U.S. president?

The North Dakota national park named after the 26th U.S. president is Theodore Roosevelt National Park.

The park honors Theodore Roosevelt, who traveled to the Dakota Territory in 1883 and returned after the deaths of his mother and first wife on February 14, 1884. His experiences ranching in the Badlands, including the loss of much of his cattle during the winter of 1886–1887, influenced his ideas about conservation and public land.

The park protects badlands along the Little Missouri River in three units: the South Unit near Medora, the North Unit, and the Elkhorn Ranch Unit. It began as Theodore Roosevelt National Memorial Park in 1947, with the North Unit added in 1948. Congress changed it to national-park status in 1978.

A common mix-up is assuming it commemorates a site in New York, where Roosevelt was born. This park is specifically tied to his formative years in the Dakota Badlands and is the only U.S. national park named for one person.