Over the Past 100 Years Tariffs on Foreign Goods Imported

Over the past 100 years tariffs on foreign goods imported to the United States have

A) increased as the United States has become more focused on domestic job security.
B) decreased as the United States has embraced free trade as a means to ensure global prosperity.
C) remained relatively stable.
D) fluctuated dramatically because Republican pres­idents tend to support tariffs whereas Democratic presidents tend to oppose them.