The contributions of the mountain men include:

A: developing the first Anglo-American settlements.

B: establishing good relations with the Native Americans.

C: developing the local resources.

D: establishing routes through the region for others to follow.

The contributions of the mountain men include:

A: developing the first Anglo-American settlements - False. The mountain men were primarily fur traders and explorers, not settlers. They were known for their ability to venture into the wilderness and survive off the land.

B: establishing good relations with the Native Americans - Partially true. Mountain men often lived among Native American tribes and learned their languages, customs, and survival skills. While not all interactions were positive, some mountain men played a role in establishing trade and peaceful relations with certain Native American groups.

C: developing the local resources - True. Mountain men played a significant role in finding and exploiting natural resources like fur-bearing animals, which were highly valuable during the heyday of the fur trade in the early 19th century. Their efforts contributed to the economic development of the regions they explored.

D: establishing routes through the region for others to follow - True. Mountain men were explorers and pathfinders who blazed trails through challenging terrains, such as the Rocky Mountains and other western regions. Their discoveries and knowledge of routes, such as the Oregon Trail, helped pave the way for later settlers, traders, and pioneers who followed them.

To receive confirmation of these contributions, you can research historical sources like books, articles, and academic papers specifically focusing on the role and contributions of the mountain men in American history. Additionally, you can visit museums or attend lectures related to the subject to gain a better understanding of their contributions firsthand.