Statistics for occurrence #1 of “Mississippi River” in chapter 12 of John G. Nicolay, The Outbreak of Rebellion:

...ct that the line from the sea to the mountains was not more than a hundred miles long, and could therefore be occupied and observed without delay. In the West the distance from the mountains to the Mississippi River was nearly ten times as great. This alone would have retarded the definition of the military frontier; but the chief element of uncertainty and delay was furnished by the peculiar political conditi...
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