Statistics for occurrence #1 of “Western Kentucky” in chapter 13 of Admiral David D. Porter, The Naval History of the Civil War.:

...d to the command of the District of Southeast Missouri, and on the 4th of September, 1861, he established his Headquarters at Cairo, Illinois. His district included Southern Illinois and so much of Western Kentucky and Tennessee as might fall into possession of the national forces. It comprised the junction of the Mississippi, Ohio, Tennessee and Cumberland Rivers, and was at the time the most important point...
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† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.