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Protectionism in the United States is protectionist economic policy that erects tariffs and other barriers on imported goods. This policy was most prevalent in the 19th century. At that time, it was mainly used to protect Northern industries and was opposed by Southern states that wanted free trade to expand cotton and other agricultural exports. Protectionist measures included tariffs and quotas on imported goods, along with subsidies and other means, to restrain the free movement of imported goods, thus encouraging local industry.
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