How did trading posts along the Mackenzie River support later Arctic expeditions?

The trading posts established along the Mackenzie River and its headwaters were essential to the success of later Arctic exploration. By the time the North West Company and the Hudson’s Bay Company merged in 1821, a network of posts had been created, extending from Great Slave Lake down to Fort Good Hope.1

These outposts provided the necessary infrastructure, supplies, and logistical support that made overland expeditions possible for explorers such as John Franklin and his successors. By serving as established bases in the remote interior, these sites allowed explorers to venture further into the Arctic regions with greater security and resources than would have been possible otherwise.1