1. The Dust Bowl was caused by a. overgrazing, plowing, and drought.
b. sheepherders who fenced the open plains.
c. too many wildcatters drilling for oil.
d. government programs that encouraged farmers not to grow crops.

2. One reason the economy slowed after World War I was that
a. too many people were looking for work.
b. government spending decreased.
c. newly discharged soldiers did not like industrial work.
d. not enough workers could be found.