Statistics for occurrence #1 of “Mississippi River” in entry army of Harper's Encyclopedia of United States History:

... numbered 25,220 men, and was mainly used in garrisoning the permanent fortifications, protecting the routes of commerce across the continent, and preserving order among the Indian tribes west of the Mississippi River . The organization of the regular army on the permanent peace basis of one soldier to each 1,000 of population, under the act of Congress of Feb. 2, 1901, was announced in the general order o...
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