Question

What ultimately led to the end of the mountain men era?

the lack of dependency on trade with native tribes
the dangers of the fur-trapping business
the near-extinction of the beaver population
the abandonment of trading posts by the British

Answer 1

The mountain men era ended because the beaver was almost drove to extinction in that area and because of fashion. Yes, the change of fashion caused the mountain men era to end. Afterward though many of them became a guide for that area since they had lived there for while.

Answer 2

the near-extinction of the beaver population

Step-by-step explanation:

Most of the mountain men eventually found into jobs as wagon train guides, Army Scouts, and settlers through the lands which they had helped open up. This all happened because of the silk trade and very much because of the quick collapse of the beaver-based fur trade in North America.