Those that built tunnels through mountains in TN so trains can easily travel through rather than trying to lay tracks over harsh terrain are:
A tunnel is an underground passage, dug through hilly soil, earth or rock, and enclosed apart from the entrance and exit, popularly at each end. A pipeline is not a tunnel, although latest tunnels have utilized internalized tube construction design rather than traditional tunnel boring methods.
Therefore, the correct answers are as given above. TN governor and the plantation owners are people that built tunnels through mountains in TN.
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