The Saint Lawrence Seaway is a system of waterways that provides a navigable route from the Atlantic Ocean to the Great Lakes, representing a monumental achievement in engineering and international collaboration. The construction of the seaway was initiated post-World War II as both Canada and the United States sought to enhance trade and access to the inland ports of the Great Lakes. Completed in 1959, this extensive project included the building of locks and dams on the St. Lawrence River, allowing ships to transit from the sea into the heart of North America.

On April 25, 1959, a ceremonial opening was held, followed by the first ships navigating through the seaway, including the bulk carrier, the S.S. Pioneer. The event not only marked the completion of several years of construction but also celebrated partnerships between two countries as they worked together to transform their navigation capabilities. The seaway was seen as a boost to the economy, promising to increase the volume of trade significantly, and to provide greater access for larger shipping vessels to penetrate deep into the continent.

The seaway allowed for a dramatic increase in shipping traffic and changed the dynamics of transportation in North America. By facilitating the movement of goods, such as agricultural products and raw materials, it opened new markets for trade and dramatically changed how industries operated within the region. The success of the seaway was a significant factor in establishing Great Lakes ports like Cleveland and Detroit as major commercial hubs.