Why did railroad companies hire people to killbuffalo?
a.
They wanted to eliminate the Native American's food supply
B. Buffalo were eating the crops planted by settlers
C. The buffalo were tearing up the train tracks
D. Buffalo were over populating the plains

answer:

B

Explanation:

increase in population

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.