鉴于丁丁博士的建议，这里附上Protectionism in the United States，看看美国贸易保护政策是如何发展形成的
-nikan(宓);
2020-8-17{1405}(#13147060@0)
Protectionism in the United States is protectionisteconomic policy that erected tariff and other barriers to trade with other nations. This policy was most prevalent in the 19th century. It attempted to restrain imports to protect Northern industries. It 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 ensure fair competition between imported goods and local goods.
