About Armstrong County
Armstrong County was a county in the U.S. state of South Dakota, and its predecessor Dakota Territory, between 1883 and 1952. Located in the western part of the state, it was a sparsely-inhabited part of the Cheyenne River Indian Reservation that relied primarily on the cattle trade and the Missouri and Cheyenne Rivers. Never having an organized county government in its own right, it was attached to Stanley County, with its county seat at Fort Pierre, for administrative purposes.
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