Which tribe was known to U.S. settlers as the “Cossacks of the Plains”?

The moniker the “Cossacks of the Plains” was given to the Comanche, a Shoshonean-speaking people who lived in western Texas, western Oklahoma, and parts of Kansas and New Mexico.

Masters of horsemanship and warfare, the Comanche clashed regularly with U.S. settlers until being forced onto reservations in the 1860s and 1870s.