What is imperialism? a. The expansion of a nation's authority through territorial conquest b. The expansion of a nation’s authority through negotiation c. The expansion of a nation’s authority through power d. The expansion of a nation’s authority through the purchasing of property Please select the best answer from the choices provided A B C D.

I think the answer to your question is C

Explanation:

answer: the correct answer is d. a christian revivalist movement in the u.s. during the early 19th century

explanation: the second great awakening was lead by the preachers of baptist and methodist congregations in order to gain support for the protestant religion from the 1790's to 1840's

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.