The approval of protective tariffs on manufactured goods contributed to the belief that their economy was threatened. Option D is correct.
The people in the south believed that their economy was threatened because, there was an approval of tariffs on goods.
They already had water bodies that they could use to transport their goods, They were then opposed to paying tariffs on roads and canals because they felt that they gave them no benefits.
They wanted a situation where even though they paid these tariffs they would derive some economic benefits too.
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