Witch posed the greatest challenge to pioneers crossing the Western mountains?
- overpopulated rest areas
-lack of water
-hot desert sand
-steep and dangerous passes

How were chinese immigrants treated in the late 1800s

The purpose of the comintern was a. to spy on anti-communist activity. b. to spread communism in other countries. c. to administer communist rule. d. to develop future communist leaders.

The economy shifted from to industrial during the first industrial revolution