Tariff rates remained high in the U.S. throughout the postbellum perio

Tariff rates remained high in the U.S. throughout the postbellum period for which of the following reasons?

(a) The government needed revenues to finance its expenditures.
(b) Special interest groups organized themselves to realize rents.
(c) Land sales dwindled as the Western frontier closed.
(d) All of the above.

ANSWER

(d)