Inkjet print of digital illustration on canvas

In and of themselves, the Great Lakes are a single interconnected waterway. After the St. Lawrence seaway was built and opened in 1959, maritime shipping for commercial enterprises in eastern Canada and the American midwest were directly connected to the Atlantic. According to the St. Lawrence Seaway Management Corporation,  From Lake Superior to the Atlantic, the seaway is 2,342 miles long and the entire seaway system comprises 9,500 square miles of navigable waters, linked by three series of locks. Along these waters, the states of Michigan, Wisconsin, Minnesota, Illinois, Indiana, Ohio, Pennsylvania and New York are connected by seaway and allow low shipping costs for coal, oil, limestone, iron ore, grains, wood products and other bulk materials, and for manufactured goods. 


Pictured: the Mill District of Niagara Falls in New York ca. 1887; a segment of the St. Lawrence Seaway dividing Canada and the United States, ca. 2001; a cargo ship passes through locks in the St. Lawrence Seaway system ca. 2007; a passenger boat passes under a bridge along the St. Lawrence Seaway ca. 1975.