A plan to strengthen and unify the nation, the American System, was advanced by the Whig Party and a number of leading politicians including Henry Clay, John C. Calhoun and John Quincy Adams. The System included such policies as:
- Support for a high tariff to protect American industries and generate revenue for the federal government
- Maintenance of high public land prices to generate federal revenue
- Preservation of the Bank of the United States to stabilize the currency and rein in risky state and local banks
- Development of a system of internal improvements (such as roads and canals) which would knit the nation together and be financed by the tariff and land sales
Clay protested that the West, which opposed the tariff, should support it since urban factory workers would be consumers of western foods. In Clay's view, the South (which also opposed high tariffs) should support them because of the ready market for cotton in northern mills. This last argument was the weak link. The South never strongly supported the American System and had access to plenty of markets for its cotton exports.
Portions of the American System were enacted by the United States Congress. The Second Bank of the United States was rechartered in 1816 for 20 years. High tariffs were first suggested by Alexander Hamilton in his 1791 Report on Manufactures but were not approved by Congress until the Tariff of 1816. Tariffs were subsequently raised until they peaked in 1828 after the so-called Tariff of Abominations. After the Nullification Crisis in 1833, tariffs remained the same rate until the Civil War. However, the national system of internal improvements was never adequately funded; the failure to do so was due in part to sectional jealousies and constitutional squabbles about such expenditures.
The American System did not enjoy overall success, however; in 1830, President Jackson rejected a bill which would allow the federal government to purchase stock in the Maysville, Washington, Paris, and Lexington Turnpike Road Company, which had been organized to construct a road linking Lexington and the Ohio River, the entirety of which would be in the state of Kentucky. Jackson's Maysville Road veto was due to both his personal conflict with Clay and his ideological objections.