There were a number of new territories added to the union, which brought about the need for compromises. these territories were

seward's folly (alaska)
territory gained from mexico in 1848
the wilmot proviso
the louisiana purchase

the right answer is the end of world war ii

after the end of a global wwii all the nations involved, in an attempt to create an organization to maintain world peace. this agreement would work settling international disputes via negotiation and arbitration instead of leading the issues escalate to another war.

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.

where is thing if you show me on the map or have a map i can answer your question