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Could a Trans-North American Canal be built?
Ideally a canal capable of PANAMAX ships being built following the Canadian/USA border. Starting at Rock, south of Vancouver then tunneled (at least 150ft high clearance at sea level) underneath the Rocky Mts to Thunder Bay where it would join the Great Lakes via enlarged locks all the way to the St Lawrence Seaway and then into the Atlantic Ocean.
Would this be possible at all?
What would be the possible cost?
What would be the savings in time compared to the Panama Canal?