Question: What do the Ohio Valley Siouan languages and the Western Siouan languages have in common?
Sentence (from "James Owen Dorsey"): James Owen Dorsey (October 31, 1848 – February 4, 1895) was an American ethnologist, linguist, and Episcopalian missionary in the Dakota Territory, who contributed to the description of the Ponca, Omaha, and other southern Siouan languages.
Relevant evidence: No