As a result of French and Indian War Spanish settlement could expand throughout Florida.
French settlement could expand east of the Mississippi River.
American Indian settlement could expand eastward.
American colonial settlement could expand westward.

they were unable to pay their debts

the east coast has nothing to do with the dust bowl, the dust bowl killed a full year's worth of crops in seconds, and with the dust on the land, the land would be worthless.   furthermore the farmers couldn't  get  out of their houses due to the dust so when the bank came to collect money, farmers couldn't  pay it

the answer is a

their confiscation of contraband and the sinking if the lusitania

first paragraph (and busy all the night ,with a silence deep and white )

working boots at local festivals