<span>To keep track of trade</span>
The correct answer is C. Plateou of Tibet. It has this name because it is the highest region of the world, but at the same time it's reasonably large (unlike single mountains).
Answer:
C. Saw the arrest of several major government figures.
Explanation:
In 1919 the red scare was a scare that led several people (most in power) to be falsely accused of being communists. This had led to several trials and arrests