What type of evidence would give a historian the best first-hand account of what occurred in the past?
a) written documents
b) clothing
c) artwork
d) tombstone etchings

i can

explanation:

an era of negotiation.

is that an answer to your question?

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.