Final answer:
In the 1920s, tariff rates in the U.S. were raised first by the Fordney-McCumber Tariff and then further increased by the Hawley-Smoot Tariff, leading to a significant rise in tariffs by 1930.
Step-by-step explanation:
In the 1920s, the Fordney-McCumber Tariff raised tariff rates, followed by the Hawley-Smoot Tariff which further raised tariff rates, resulting in substantially higher tariffs by 1930 compared to the beginning of the decade. The correct answer to the fill-in-the-blank question is: a. raised; raised; raised.
The Smoot-Hawley Tariff Act of 1930 significantly increased tariffs with the intention of protecting American farmers and industries from foreign competition. However, it led to other countries enacting retaliatory tariffs, causing a decline in international trade. This was particularly detrimental as the United States experienced job losses and an overall economic downturn during the Great Depression. The high tariffs of the Smoot-Hawley Act represented an isolationist and protectionist policy but ultimately had counterproductive effects on both the U.S. and global economies.