Question

how did fur traders help in the westward expansion of the united states?
they established forts along the oregon trail that protected settlers moving west.
the fur trade required a large work force to be profitable.
they worked as scouts, bringing settlers out to the pacific northwest.
the trails they established to move their furs east were later used by pioneers.

Explanation:

Fur traders created trails for transporting furs. These trails were later utilized by pioneers during westward expansion.

Answer:

The trails they established to move their furs east were later used by pioneers.