Answer:
Native Americans.
Explanation:
A mountain man refers to an individual who is an explorer and his natural place of habitation is the wilderness. They were commonly found in the North American Rocky Mountains around 1810 to the 1880s and their main occupation was fur trade.
Jim Bridger is generally considered to be one of the most widely known Mountain Men around the world.
Hence, the Mountain Men had most in common and the most contact with Native Americans.
