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n. pl. Atsina or At·si·nas
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Red Cloud spoke from a particular Assiniboine conception of the tribal land during the period of intertribal wars prior to the establishment of the reservation system, when these boundaries were hotly contested with the neighboring (Atsinas) Gros Ventre and Lakota people.
All through Montana they had met not a single Indian: historians are uncertain why not, except that the Assiniboin and Atsinas may have been wary of the white strangers.