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AP U.S. History · Unit 4: Period 4 · 1800–1848

4.3 Politics and Regional Interests

Regional Economies Diverge

By the early 1800s, the North developed manufacturing and commerce, the South relied on cotton and enslaved labor, and the West grew through farming and expansion. These differing economic interests fueled political conflicts over tariffs, internal improvements, and the national bank, as each region sought federal policies benefiting its own economy.

The American System

Henry Clay's American System proposed a protective tariff, a strong national bank, and federally funded internal improvements (roads, canals) to unify the economy. The North generally supported it; the South, dependent on trade with Britain and skeptical of federal power, largely opposed tariffs like the Tariff of 1828 ('Tariff of Abominations'), sparking the Nullification Crisis.

Sectionalism and Federal Power Debates

Growing sectionalism intensified debates over states' rights versus federal authority. South Carolina's nullification of the 1828 tariff, championed by John C. Calhoun, challenged federal supremacy. President Andrew Jackson opposed nullification, leading to the Force Bill and a compromise tariff, foreshadowing deeper North-South divisions over economic and political power.

Key terms

American System
Henry Clay's plan for a protective tariff, national bank, and internal improvements to unify the U.S. economy.
Tariff of Abominations (1828)
A high tariff that angered the South, seen as favoring northern manufacturing over southern agriculture.
Nullification Crisis
Conflict sparked when South Carolina declared the 1828 tariff void, testing federal vs. state authority.
John C. Calhoun
South Carolina politician who championed states' rights and the theory of nullification.
Force Bill
Legislation backed by Jackson authorizing federal enforcement of tariff laws against South Carolina's defiance.

Try an AP-style question

The Missouri Compromise (1820)…

  1. banned slavery north of 36°30′ in the Purchase
  2. admitted Missouri as a free state
  3. banned slavery in every U.S. territory
  4. allowed slavery in every new state
Show the answer

A. Balance.

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