Abstract
The area between the Great Lakes and Lake Winnipeg, bounded on the north by the Hudson Bay lowlands, is sometimes known as the "Petit Nord." Providing a link between the cities of eastern Canada and the western interior, it was a critical communication and transportation hub for the North American fur trade for over 200 years. It also became the dispersal point for waves of devastating disease. An extensive trading network, both among Aboriginal groups and fur trade society, carved a path for the diffusion of diseases such as smallpox, influenza, and measles.