In the 1960s, an era of widespread social turbulence, the shipping industry in the Great Lakes was on the threshold of immense change. Developed during World War II, the U.S. merchant fleet faced threatening competition from the newer Canadian fleet. The demand for iron ore skyrocketed as baby boomers matured into the age of auto and appliance buying. To meet the increasing need, there was talk of expanding the size of the Soo Locks to accommodate...