Answer:
It was opposed by the Democratic Party of Andrew Jackson, Martin Van Buren, James K. Polk, Franklin Pierce, and James Buchanan prior to the Civil War, often on the grounds that the points of it were unconstitutional
Step-by-step explanation:
According to the excerpt you provided, Henry Clay’s American System constituted the basis for social improvement through sale of its enormous land holdings, the federal government could well afford to subsidize internal improvements. By levying protective tariffs, the government should foster the development of American manufacturing and agricultural enterprises that, in their infancy, might not be able to withstand foreign competition. The promotion of industry would create a home market for agricultural commodities, just as farms provided a market for manufactured products1. The American System became the leading tenet of the Whig Party of Henry Clay and Daniel Webster. It was opposed by the Democratic Party of Andrew Jackson, Martin Van Buren, James K. Polk, Franklin Pierce, and James Buchanan prior to the Civil War, often on the grounds that the points of it were unconstitutional