Which industry threatened the Okefenokee Swamp prior to 1957?

Transportation Industry

Explanation:

Prior to the federal government purchase of lands surrounding the swamp in 1935, for the purpose of conservation and game project. There were organizations that sought to have the construction of a swamp canal across the swamp and as well building a massive highway in the area.

Hence, the Transportation Industry is the industry that threatened the Okefenokee Swamp prior to 1957

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