Statistics for occurrence #1 of “Mississippi River” in chapter 17 of John G. Nicolay, A Short Life of Abraham Lincoln, condensed from Nicolay and Hayes' Abraham Lincoln: A History:

...st, the primary field of strategy. According to geographical features, the second great field of strategy lay between the Alleghany Mountains and the Mississippi River, and the third between the Mississippi River , the Rocky Mountains, and the Rio Grande. Except in Western Virginia, the attitude of neutrality assumed by Kentucky for a considerable time delayed the definition of the military frontier and the ...
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