Mountain men were primarily motivated by profit, trading Amerindians (and sometimes trapping) for beaver and other skins and selling the skins, although some few were more interested in exploring the West and traded solely to support their passion.
p.s. Taylor did this lol :)
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The mountain men era ended because the beaver was almost drove to extinction in that area and because of fashion. The change of fashion caused the mountain men era to end.
Trappers
Mountain Men had to be resourceful simply because the had no one to rely on. In most cases these men were several weeks ride from any civilization. With no room for error, or a Wal-Mart in sight, they had to make the best out of the situation at hand. If you want to see a good movie on Mountain Men and how they survived, I suggest Jerimiah Johnson with Robert Redford.
Ethan Allen .
Flying pigs! Raining men! MOUNTAIN VOLCANO HOUSE HIGHWAY