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From a purely technical viewpoint the Plains
properly formed only a comparatively small portion of that extensive area
of prairie country of the Midwest. However, in history, the term has
become quite generally applied as descriptive of all that vast region of
grass land and arid desert which extended like an uncharted sea of green
and brown desolation between the valley of the
Missouri River
upon the north and east, and the foothills of the Rockies.
This truly immense territory, extending from about the center of the
Dakotas southward to the Rio Grande River, possessed an average width of
five hundred miles. It embraced
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