Macro-Siouan languages
In the 19th century, Robert Latham suggested that the Siouan languages are related to the Caddoan and Iroquoian languages. In 1931, Louis Allen presented the first list of systematic correspondences between a set of 25 lexical items in Siouan and Iroquoian. In the 1960s and 1970s, Wallace Chafe further explored the link between Siouan and Caddoan languages. In the 1990s, Marianne Mithun compared the morphology and syntax of all the three families. At present, the Macro-Siouan hypothesis based on relations among Siouan, Caddoan, and Iroquoian is not universally accepted as proven.
Montmartre, Saskatchewan
Assiniboine is a Siouan language. It was derived from other Sioux dialects at the same time as other Sioux languages were being diverged and differentiated from each other. The language today is endangered, and there are very few speakers that are living. Most Assiniboine today are English speakers.