Language group created by the Astor to cover what the hotel literature calls the "Indians par excellence," those of the American Midwest.

From the Astor description: "A GROUP OF CROW CHIEFS. The Crows in former times had a very peculiar manner to dress their hair of the forehead, which they combed and stiffened in such a way that it stood up, as seen in the photograph."
Tribes represented in the Sioux Rooms according to the hotel included the Sioux, the Dakota, the Assiniboines, the Crow, the Iowa, the Kansa, the Mandan, the Minitari, the Missouri, the Omaha, the Osage, the Oto, the Ponca, the Arkansa, and the Winnebago.