APUSH Period 4 (1800–1848) covers the early republic through manifest destiny — roughly 10% of the exam. The Market Revolution and the reform movements it generated (abolition, temperance, women's rights) are the most essay-tested themes of this period.
The Market Revolution
Market Revolution — 1820s–1850s transformation from subsistence to commercial economy; driven by transportation improvements (Erie Canal 1825, railroads 1830s), manufacturing (Lowell mills, interchangeable parts), and national banking. Lowell Mills — first large-scale textile factories; employed young New England farm women (Lowell girls); paternalistic but controlled; early labor organizing (1834, 1836 strikes). Cult of Domesticity — ideology that middle-class women's proper sphere was the home; virtuous wife and mother; separated "private" domestic life from "public" male economic life — a consequence of Market Revolution removing production from the household.
Political Developments
Era of Good Feelings (1817–25) — one-party (Democratic-Republican) dominance under Monroe; apparent national unity masking sectional tension. Missouri Compromise (1820) — admitted Missouri (slave) and Maine (free); drew slavery line at 36°30'; maintained Senate balance; "a firebell in the night" (Jefferson) — papered over sectional conflict without resolving it. Jacksonian Democracy — Andrew Jackson's populist politics: expanded white male suffrage, spoils system (rotation in office), Indian Removal, opposition to national bank (Bank War); represented by Democratic Party. Indian Removal Act (1830) — forcibly relocated eastern Native nations west of Mississippi; Trail of Tears (Cherokee, 1838) — ~4,000 died.
Territorial Expansion and Slavery
Manifest Destiny — belief that US expansion to Pacific was divinely ordained; used to justify Texas annexation (1845), Oregon boundary (1846), and Mexican-American War (1846–48). Mexican-American War (1846–48) — US gained California, New Mexico, Arizona, Nevada, Utah, Colorado (Mexican Cession); reopened slavery expansion debate; Wilmot Proviso (proposed banning slavery in new territories) failed but established free-soil vs. slave state divide.
Reform Movements
Second Great Awakening — early 19th-century religious revival; perfectionism (humans can improve themselves and society); fueled abolition (slavery as sin), temperance, prison reform, and women's rights. Abolition movement — William Lloyd Garrison (The Liberator, 1831; immediatism); Frederick Douglass (escaped enslaved person, orator); Underground Railroad (Harriet Tubman). Seneca Falls Convention (1848) — first women's rights convention; Declaration of Sentiments ("all men and women are created equal"); demanded suffrage; Elizabeth Cady Stanton, Lucretia Mott.
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