The KFS does seem to rely on rivers and mountains for borders. The Tennessee and Ohio Rivers provide a substantial obstacle for any potential invader. The KFS probably monitors and maintains the few bridges and provides the ferries that cross both rivers. I think that the few monitors the KFS has on the rivers are going to be powered by steam. Steam power is sufficient for river travel, is easy to maintain at a lower technology level, and if it falls into 'enemy' hands it is not a technology that would provide said 'enemy' an advantage. Of course, having any significant river transport would require clearing the channel of snags and erecting some wing dams or dikes to coax the flow to a preferred, deeper water channel.
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