The 15 Locks That Give Canada Leverage Over the US Economy

13 of the 15 locks on the St. Lawrence Seaway — the front door to America's heartland — are owned and operated by Canada. America owns two. And they sit in the middle of a Canadian-controlled river. The Seaway is a 3,700 km marine highway lifting ocean ships 557 feet — the height of a 60-story building — from the Atlantic into the Great Lakes. It's the reason Duluth, Minnesota is a seaport. Eight U.S. states, 100+ ports, ~3,000 ships and 36 million tonnes of cargo a year, supporting some 237,000 jobs and $35 billion across both countries. Midwest grain, iron ore, steel — all of it passes through gates with a Canadian hand on the handle. How did Canada end up owning the door? Because America refused to build it. For 60 years, Congress blocked the Seaway. In 1951, Canada's PM told Truman: fine — Canada will build it ALONE. That threat broke the deadlock. And during negotiations, President Eisenhower taunted Canada that it would be better off as the 49th state — the exact same annexation jab Trump uses today, 70 years early, over this exact waterway. Canada answered by threatening to build its own locks. Washington backed down. Canada paid 75% of the bill ($336.5M vs $133.8M), drowned nine of its own communities — the Lost Villages, 6,500 people relocated — and in 1959, Queen Elizabeth II and Eisenhower opened it together aboard the Britannia. The honest truth: Canada has never threatened to close the Seaway, and almost certainly never will — Prairie grain depends on it too, and weaponizing it would torch the "stable partner" reputation Carney is selling. A 2023 strike that closed the locks for one week alarmed BOTH sides of the border. And today's Seaway (36M tonnes) is below its 1977 peak (57M). The leverage is real — but it's the kind you hold, not the kind you use. This is the story of how Trump spent a year threatening the one neighbor that owns the locks on America's own front door. Sources: Transport Canada, The Canadian Encyclopedia, History.com, Institution of Civil Engineers, Encyclopedia.com, Great Lakes St. Lawrence Seaway System, Global News. 🤖 TRANSPARENCY: This video was created with AI assistance — AI-generated voice, AI-assisted research and writing. Real sources, real analysis. StLawrenceSeaway GreatLakes TrumpTariffs MarkCarney CanadaUSTradeWar WellandCanal JamesWren TheDecisionRoom