Which group of traders worked for fur companies and conducted business with Native American tribes in North Dakota?

The correct response points to the group of traders known as the North Traders. This group was specifically engaged in the fur trade in the northern regions of what is now North Dakota, collaborating closely with Native American tribes. The North Traders established critical trade networks, facilitating the exchange of goods between European settlers and Indigenous peoples, which played a significant role in the economic and social dynamics of the region during the fur trade era.

These traders not only dealt with pelts and furs but also engaged in a variety of transactions that included food, tools, and other essentials necessary for daily life, integrating themselves into the culture and economy of the Native American tribes. By building relationships and alliances, they significantly influenced both Indigenous economies and the fur trade industry's development.

The other groups listed do not specifically fit the historical context of fur trade activities in North Dakota. Frontier Traders generally refer to those involved in more southwest or broader western expansion trade, Mountain Traders were primarily associated with mountainous regions, and River Traders focused on trade facilitated by river systems but not exclusively tied to the fur trade or specifically to Native American tribes in North Dakota.