As "a plain matter of national self-interest," President Truman this week demanded U.S. participation in construction of the St. Lawrence Seaway and power project. Truman said in a message to Congress that an entirely new situation had been created by Canada's decision to build the seaway alone if the U.S. did not participate (see HEMISPHERE) .

Talking directly to the seaway's opponents, "certain railroads and port interests," Truman warned that Canada would charge-tolls of U.S. ships, perhaps even after the cost of the seaway had been paid off. He argued that an inland (i.e., submarine-proof) route to bring iron ore from...

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