Final answer:
During the mid-19th century, the U.S. government promoted economic growth by raising tariffs on imported goods.
Step-by-step explanation:
The U.S. government promoted economic growth during the mid-19th century by raising tariffs on imported goods. By imposing higher taxes on foreign products, the government made them more expensive, which protected domestic businesses and encouraged the growth of industries in the United States. This policy aimed to prevent competition with foreign goods and promote the development of a nation's own industries.