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Unit 4
10–17% of examBetween 1800 and 1848 the young United States grew fast: it doubled in size, built canals, railroads and factories, and gave the vote to almost all white men. That growth also sharpened fights over slavery, federal power and the treatment of American Indians, setting up the crisis of the 1850s.
Longer videos that cover the whole unit. Good for a first pass or a final review.
This opening topic sets the scene for 1800–1848. The country doubled in size, canals, railroads and factories built a national market economy, and voting opened up to nearly all white men. At the same time, arguments over slavery, federal power and the treatment of American Indians grew sharper.
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Jefferson's Democratic-Republicans beat the Federalists in 1800, and power changed hands peacefully. Jefferson bought Louisiana from France in 1803 even though the Constitution didn't clearly allow it, while Chief Justice John Marshall's Supreme Court, starting with Marbury v. Madison (1803), established judicial review: the courts' power to strike down laws that conflict with the Constitution.
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The North, South and West wanted different things from Washington, especially on tariffs, a national bank and slavery. Henry Clay's American System tried to bind the regions together economically, and the Missouri Compromise of 1820 calmed the slavery fight for a while by admitting Missouri as a slave state, Maine as a free state, and banning slavery north of 36°30′ in the rest of the Louisiana Purchase.
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The U.S. fought Britain in the War of 1812 over things like the impressment of American sailors and British support for Native resistance, and came out more confident. It then gained Florida from Spain in the Adams-Onís Treaty (1819) and, in the Monroe Doctrine (1823), warned European powers not to set up new colonies in the Western Hemisphere.
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New roads, canals like the Erie Canal (1825), steamboats and railroads let farmers and factories sell to distant buyers. Textile mills such as those in Lowell, Massachusetts, interchangeable parts and the telegraph sped production and communication, and Southern cotton fed Northern mills, banks and shippers.
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As more people worked for wages instead of on family farms, a new middle class grew, but so did the gap between rich and poor. Middle-class families embraced the idea of 'separate spheres' (men at work, women at home), while Irish and German immigrants poured into Northern cities and sometimes met hostility from native-born Americans.
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By the 1820s and 1830s most states had dropped property requirements, so nearly all adult white men could vote, while women and most free Black men could not. After the disputed election of 1824, Andrew Jackson's supporters built the Democratic Party, and his opponents formed the Whigs, creating the Second Party System.
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President Andrew Jackson used federal power forcefully but selectively. He signed the Indian Removal Act (1830), which led to the Cherokee Trail of Tears despite Worcester v. Georgia (1832); he threatened force against South Carolina in the Nullification Crisis; and he vetoed the recharter of the Second Bank of the United States.
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Americans tried to create a culture of their own, mixing European influences with American settings and themes. Romantic writers and transcendentalists like Ralph Waldo Emerson and Henry David Thoreau praised individualism and nature, Hudson River School painters celebrated the landscape, and narratives by formerly enslaved people became an important American literature.
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A wave of Protestant revivals in the early 1800s stressed that each person could choose salvation and work to improve the world. Preachers like Charles Grandison Finney drew huge crowds, Methodist and Baptist churches grew quickly, and the revival's energy fed the reform movements of the age.
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Reformers formed voluntary groups to change individual behavior and fix society. They campaigned for temperance, public schools (Horace Mann), better care for the mentally ill (Dorothea Dix) and the end of slavery (William Lloyd Garrison, Frederick Douglass), and women's rights activists met at the Seneca Falls Convention in 1848.
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Northern states gradually ended slavery, and free Black communities built their own churches, like Richard Allen's African Methodist Episcopal Church, schools and antislavery groups. In the South, enslaved people resisted in everyday ways and sometimes through revolts such as Nat Turner's rebellion in 1831, which led to harsher slave laws. Many free Black leaders also rejected the American Colonization Society's plan to send free Black Americans to Africa.
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Cotton became the South's main export, and slaveholders moved west into Alabama, Mississippi and Louisiana. Between 1790 and 1860 about a million enslaved people were forced from the Upper South to the Deep South, many of them sold through the domestic slave trade. Most white Southerners owned no enslaved people, but a planter elite dominated politics and increasingly defended slavery as a 'positive good'.
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This skill topic asks you to explain causes and effects across Period 4. For example, how did the market revolution and the Second Great Awakening spark reform movements, and how did the spread of cotton deepen the split between North and South? Practice telling short-term triggers apart from long-term causes.
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