The St Lawrence Seaway facilitates trade both for Canada and the US. It allows ocean-going vessels to penetrate almost to the centre of North America, serving US cities such as Chicago and Duluth,...
President Dwight D. Eisenhower formally opened the Seaway with a short cruise aboard Royal Yacht Britannia.
Parts of it are canals, but most of it is the St Lawrence River.
It was a joint project between Canada and the USA.