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.
List of endangered languages in Canada
Assinibone is one of the language divisions out of five main language divisions within the Dakotan group of the Siouan family. The sound of this language differs from the other languages in the group because it merges voiceless stops with voiced stops. There are reports that syllabics to have been used by Assinibone speakers. (A written character to represent a syllable). The Assiniboine language is spread over 2 communities in Canada, and is mainly used by older adults.