How did a high enslaved population in the southern states threaten the people of the northern states? It meant the exported crops would primarily come from the South.
It made it much harder to put an end to slavery.
It pressured the free states to reconsider the issue of slavery.
It potentially gave the South more power in the government.

its c

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.

the answer would more than likely a.)falling crop prices  

hope the answer is right and ,either way have a nice day.