Final answer:
The internal improvements made in the United States following the War of 1812 were mostly funded through tariffs resulting from the American System.
Step-by-step explanation:
The internal improvements made in the United States following the War of 1812 were mostly funded through tariffs resulting from the American System. The American System, proposed by Henry Clay, aimed to promote economic growth and unify the country. It included the implementation of protective tariffs on imported goods, which generated revenue for the government and funded internal improvements such as roads, canals, and bridges.
Learn more about Tariffs in the United States after the War of 1812