View at the Cannonball concretions pullout — in Theodore Roosevelt National Park, North Dakota, Creative Commons Attribution-Share Alike 3.0 Unported / MDuchek
[Theodore Roosevelt National] Park covers 70,446 acres of land in three sections [of southwestern North Dakota]: the North Unit, the South Unit, and the Elkhorn Ranch Unit. The park is named for the 26th President of the United States. [Theodore] Roosevelt first came to the North Dakota badlands to hunt bison in September 1883. During that first short trip, he got his bison and fell in love with the rugged lifestyle and the "perfect freedom" of the West. In 1884 his first wife, Alice Lee Roosevelt, and his mother died on the same day. Roosevelt spent much of the next two years [at Elkhorn Ranch]. There he mastered his sorrow as he lived in the saddle, driving cattle, [and] hunting big game. The [North Dakota] badlands [were] very important in Roosevelt's life, and the park memorializes his contributions to the conservation of America's natural resources.
Long before the ranching period in the late-19th century, the badlands were utilized by a number of traditional peoples including the Mandan, Hidatsa
President Truman established the Theodore Roosevelt National Memorial Park on April 25, 1947, the only National Memorial Park ever established. In 1978, in addition to boundary adjustments and the establishment of 29,920 acres of the Theodore Roosevelt Wilderness, the park's designation was changed to Theodore Roosevelt National Park.