Statistics for occurrence #1 of “Mississippi River” in chapter 2.8 of The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 1: The Opening Battles.:

...d miles wide and the western section was about four hundred miles wide. In Maryland, northwestern Virginia, Kentucky, and Missouri sentiment was divided between the Union and the Confederacy. The Mississippi River separated three of the seceding States from the remaining eight. The immense amount of supplies needed for a great army caused military operations on a large scale to be confined to rail and wate...
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