By 1850, the single largest U. S. commodity export (in terms of value) was:
a. iron railroad tracks.
b. wheat.
c. cotton.
d. slaves.
Question 2
In 2001, the labor force participation rate of women was ________.
a. about 10 percent.
b. about 25 percent.
c. just over 60 percent.
d. more than 80 percent.