US expansion, sectional conflict, Civil War and Reconstruction
Jeffersonian and market change
The election of 1800 was a peaceful transfer of power between parties, though the Twelfth Amendment followed the tie. Marbury v. Madison (1803) established judicial review, not legislative supremacy. The Louisiana Purchase (1803) doubled the nation and was explored by Lewis and Clark; the Embargo Act (1807) damaged the economy more than Britain or France. The War of 1812 produced a surge of nationalism and discredited the Hartford Convention's Federalists. After 1815, the market revolution-canals, steamboats, railroads, the cotton gin-linked regions and deepened slavery's expansion.
Democracy and its limits
Jacksonian democracy expanded white male suffrage while excluding women, Native Americans, and free Black people. The Indian Removal Act (1830) led to the Trail of Tears despite Worcester v. Georgia. The nullification crisis tested federal authority; the Bank War and Panic of 1837 revealed economic fragility. The Second Great Awakening fueled reform: abolitionism, temperance, education, and women's rights, culminating at Seneca Falls (1848). The Missouri Compromise (1820) drew the 36°30′ line, and Manifest Destiny drove Texas annexation and the Mexican-American War.
Traps: Marbury involved judicial review of a statutory provision; distinguish constitutional invalidation from a general political power to replace Congress. 'Era of Good Feelings' was a brief one-party appearance, not harmony. The Missouri line applied to the Louisiana Purchase territory, not all the West. The Wilmot Proviso(1846) proposed excluding slavery from territory acquired fromMexico but did not become law.
Worked example: if asked what most encouraged the market revolution, choose transportation improvements plus the cotton gin and commercial credit, not a single invention.
Rule of thumb: expansion and democracy advanced together for white men-and generated sectional conflict over slavery's extension.
Sectional crisis
The Mexican Cession forced the slavery question into national politics. The Compromise of 1850 admitted California free and strengthened the Fugitive Slave Act, which radicalized northerners. Uncle Tom's Cabin, the Kansas-Nebraska Act (1854), Bleeding Kansas, and the Dred Scott decision (1857) eroded compromise. Dred Scott held that Congress could not bar slavery in territories and that Black people could not be citizens. The Lincoln-Douglas debates, John Brown's raid, and the 1860 election split the Democratic Party and prompted secession.
Civil War and Reconstruction
The war began at Fort Sumter. The Emancipation Proclamation (1863) freed enslaved people in rebel territory, not border states, and made emancipation a war aim. Gettysburg and Vicksburg turned the tide. The Thirteenth Amendment prohibited slavery and involuntary servitude with its stated exception for punishment of a duly convicted crime; the Fourteenth established birthright citizenship, due process, and equal protection; the Fifteenth prohibited denial of voting rights on the stated racial grounds; this did not eliminate other formal exclusions or practical suppression. Radical Reconstruction imposed military districts and the Freedmen's Bureau, while Black Codes and later Jim Crow sought to restore racial control. The Compromise of 1877 withdrew federal troops and ended Reconstruction.
Traps: the Emancipation Proclamation did not free all enslaved people; the Thirteenth did. The Fourteenth's equal protection clause was not enforced for decades (Plessy, 1896). The Fifteenth did not guarantee the vote to women or to all men in practice. Reconstruction ended in 1877, not 1865.
Worked example: if asked why Radical Reconstruction failed, connect federal retreat, Supreme Court narrowing, paramilitary violence, and northern fatigue-not just racism in the South.
Rule of thumb: distinguish war aims from war results-emancipation was gradual, contingent, and completed by amendment.