Final answer:
The St. Lawrence Seaway's vital role lies in how it connects the Great Lakes to the Atlantic Ocean, which is key for trade and the transport of goods, significantly influencing the economic development of both the United States and Canada.
Step-by-step explanation:
The St. Lawrence Seaway is a crucial waterway connecting the Great Lakes to the Atlantic Ocean, enabling ocean-going vessels to reach the industrial heartland of North America. Established in the 1950s, the Seaway is pivotal to the development of both the United States and Canada, facilitating the movement of goods and materials between the two countries and to overseas markets.
This route supports the economies of both nations, contributing to the success of mass-production industries and agribusiness by providing a cost-effective transportation mode for bulk goods. Historically, canal systems, like the Erie Canal, played a similar role, connecting inland territories to coastal cities and export ports. These water-based transportation systems contributed to the settlement and expansion of the western United States, boosting New York City's status as a major trading hub. The creation of the St. Lawrence Seaway built upon these earlier successes and continues to be integral to trade and commerce in the region.