Which best describes the ways the united states' tariff policies between 1816 and 1860 contributed to the south's secession and the civil war? a) the united states' tariff policies caused northern states to become jealous of southern states' manufacturing power. b) the united states' tariff policies created a positive relationship between the american south and britain. c) the united states' tariff policies favored northern manufacturers and harmed southern farmers. d) the united states' tariff policies made slavery illegal in the southern states in the union.