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We used the creating America History Book.

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They opened up the west  for other explorations and for other Americans that moved.

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They trapped so many  beavers that the trapped out the streams. In 1840 silk hats as the fashion and fur trade died out.the Mountain Man's explorations provided Americans with some of the earliest first hand know lege of the far west. the faced blocked passes through the mountains , grizzly bears and no food.

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Snow often blocked higher passes wagon trains couldn't go through higher passes. they sometimes had to go for days without food.they also faced grizzly bears and Native Americans, and bad trails.

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Mountain men went west to trap beavers to make mens hat that were in fashion. They  face grizzly bears and they had to discover routes through the Rocky Mountains. sometimes they killed off all the beavers in one stream so they had to move farther west.