The closing of the frontier in the early 20th century led eventually to
(a) exhausting the land of all fertility by overusing it.
(b) a change from an intensive to an extensive use of the land.
(c) an emphasis on water conservation projects and the irrigation of arid lands.
(d) the sale of Bureau of Land Management and Forest Service lands to provide more land
for private agriculture.
Question 2
In 2002 the steel industry successfully lobbied Congress to impose a tariff of 8 to 30 percent on foreign steel. Which of the following is an unintended consequence of this tariff?
(a) U.S. steel firms were protected from the price cutting efforts of foreign competitors benefiting from governmental support in their countries.
(b) U.S. steel firms could charge higher steel prices in order to boost profits.
(c) Many steel-using firms in the U.S. went out of business and about 200,000 workers lost their jobs to higher steel prices.
(d) American steel workers kept their jobs.
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