When the United States raised tariffs on more than 900 items with the Hawley-Smoot Tariff Act of 1930, the major trading nations of the world reciprocated with similar increases.

• 美国通过它1930年的Hawley-Smoot税法增加了超过900多项的税率，导致世界主要的贸易伙伴相互采取类似的增加关税措施。