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| Term | Definition |
|---|---|
| Manifest Destiny | belief that the United States was destined—often framed as by God and history—to expand across North America from the Atlantic to the Pacific, used to justify westward expansion and territorial acquisitions in the mid‑19th century |
| Texas annexation question | debate over whether to annex the Republic of Texas as a state, which raised sectional tensions because adding Texas as a slave state threatened the balance between free and slave states preserved by the Missouri Compromise |
| Oregon | the Oregon Country, a disputed region in the Pacific Northwest claimed by both the United States and Britain; ultimately divided by the Oregon Treaty of 1846, which set the boundary at the 49th parallel |
| Nueces line | the Nueces River boundary claimed by Mexico as the southern border of Texas, in contrast to the Rio Grande boundary claimed by the United States; Polk used the disputed zone to justify sending troops and provoking the Mexican‑American War |
| Slidell Mission | John Slidell's 1845‑1846 diplomatic mission to Mexico to negotiate the purchase of New Mexico and California and settle the Texas border dispute; Mexico refused to receive him, which the U.S. used to build the case for war |
| Mexican American War | war between the United States and Mexico from 1846 to 1848, triggered by disputes over Texas's border and U.S. expansionist ambitions under Manifest Destiny; ended with U.S. victory and major territorial gains |
| Bear Flag Republic | short‑lived independent republic declared by American settlers in California in 1846 during the Mexican‑American War, which quickly came under U.S. control and was used to justify American occupation of California |
| Treaty of Guadalupe-Hidalgo | 1848 peace treaty ending the Mexican‑American War, in which Mexico ceded a vast territory to the United States and the U.S. agreed to pay Mexico about fifteen million dollars |
| Mexican Cession | the territory ceded by Mexico to the United States in the Treaty of Guadalupe‑Hidalgo, including present‑day California, Nevada, Utah, most of Arizona, and parts of New Mexico, Colorado, and Wyoming |
| Wilmot Proviso | proposal introduced by David Wilmot in 1846 that sought to ban slavery in any territory acquired from Mexico, intensifying sectional conflict and helping reshape the political landscape |
| Gold Rush | the California Gold Rush beginning in 1848–1849 after gold was discovered at Sutter's Mill, triggering mass migration of "forty‑niners" and accelerating California's admission to the Union as a free state |
| Compromise of 1850 | set of five bills designed to ease sectional tensions, including admitting California as a free state, organizing New Mexico and Utah under popular sovereignty, strengthening the Fugitive Slave Act, and ending the D.C. slave trade |
| Young America | mid‑19th‑century political and cultural movement associated with the Democratic Party that promoted expansionism, Manifest Destiny, and modernization of the economy and political system |
| Commodore Matthew Perry | U.S. Navy officer whose 1853–1854 expedition to Japan forced the Tokugawa shogunate to sign the Treaty of Kanagawa, opening Japanese ports to American trade and marking the beginning of U.S. engagement with East Asia |
| Ostend Manifesto | 1854 document drafted by U.S. diplomats suggesting that the U.S. should purchase or, if necessary, seize Cuba from Spain to expand slave territory; leaked and widely criticized as a pro‑slavery conspiracy |
| Stephen Douglas | Illinois Democratic senator who championed popular sovereignty and sponsored the Kansas‑Nebraska Act, deepening sectional divisions and polarizing the nation over slavery |
| Kansas-Nebraska Act | 1854 law that organized Kansas and Nebraska territories and allowed settlers to decide the slavery question through popular sovereignty, effectively repealing the Missouri Compromise and sparking violent conflict in "Bleeding Kansas" |
| Republican Party | new political party formed in the 1850s out of opposition to the expansion of slavery, drawing antislavery Whigs and some Democrats; became the main rival to the Democrats and the party of Abraham Lincoln |
| Bleeding Kansas | violent conflict in the Kansas Territory in the mid‑1850s between pro‑slavery and antislavery settlers, reflecting the breakdown of compromise and the escalation of sectional violence over slavery |
| Free-Soil Platform | political stance opposing the expansion of slavery into western territories without necessarily demanding immediate abolition in the South, held by the Free‑Soil Party and later the Republicans |
| Dred Scott v. Sandford | 1857 Supreme Court decision declaring that enslaved people were not citizens, had no standing to sue, and that Congress could not prohibit slavery in the territories, invalidating the Missouri Compromise and intensifying sectional strife |
| Abraham Lincoln | Illinois lawyer and Republican politician who opposed the expansion of slavery, won the 1860 presidential election, led the Union during the Civil War, and issued the Emancipation Proclamation |
| Lincoln-Douglas Debates | 1858 series of seven debates between Abraham Lincoln and Stephen Douglas over slavery and popular sovereignty, elevating Lincoln's national profile and highlighting the growing divide between North and South |
| Election of 1860 | presidential election in which Republican Abraham Lincoln won on a platform opposing slavery's expansion; his victory prompted Southern states to begin seceding from the Union |
| Secession | the formal withdrawal of Southern states from the United States following Lincoln's election, beginning with South Carolina in late 1860 and leading to the formation of the Confederate States of America and the Civil War |
| Clipper ships | fast, sleek sailing vessels developed in the mid‑19th century that greatly reduced travel and trade time, especially during the California Gold Rush, by speeding transport across the Atlantic and to Pacific ports |
| Homestead Act | 1862 law that granted 160 acres of public land to settlers who lived on and improved it for five years, promoting western migration and ideals of small‑farm ownership |
| National Bank Acts | Civil War‑era laws that created a system of national banks and a uniform national currency, centralizing financial power and helping finance the Union war effort |
| Emancipation Proclamation | 1863 executive order issued by Abraham Lincoln declaring enslaved people in Confederate states free, transforming the Civil War's purpose to include the destruction of slavery |
| Gettysburg | site of the Battle of Gettysburg (July 1863), a turning‑point Union victory in Pennsylvania that repelled Lee's invasion of the North and marked the beginning of the Confederacy's decline |
| Gettysburg Address | short speech delivered by Lincoln at the dedication of the Gettysburg National Cemetery in 1863, redefining the war as a struggle to preserve a government "of the people, by the people, for the people" and to uphold equality |
| Sherman's March to the Sea | 1864 Union military campaign led by General William Tecumseh Sherman from Atlanta to Savannah, using total war tactics to destroy Confederate infrastructure, resources, and civilian morale |
| Freedmen's Bureau | federal agency established in 1865 to provide food, medical aid, education, and legal assistance to formerly enslaved people and impoverished whites during Reconstruction |
| 13th Amendment | constitutional amendment ratified in 1865 that formally abolished slavery throughout the United States |
| Moderate v. Radical Republicans | two factions within the Republican Party during Reconstruction; Moderates favored a conciliatory approach to restoring the South while Radicals pushed for stricter terms, stronger Black civil rights protections, and federal enforcement |
| Lincoln's 10% Plan | 1863 Reconstruction proposal allowing a Southern state to rejoin the Union once 10 percent of its 1860 voters swore loyalty and the state abolished slavery, reflecting a lenient approach to Reconstruction |
| Wade-Davis Bill | 1864 Radical Republican Reconstruction plan requiring a majority of white male citizens in a Southern state to swear loyalty before readmission and mandating stronger safeguards for freedpeople; Lincoln pocket‑vetoed it |
| 14th Amendment | 1868 constitutional amendment granting citizenship to all persons born or naturalized in the United States and guaranteeing equal protection under the law, central to Reconstruction's legal framework |
| 15th Amendment | 1870 constitutional amendment prohibiting states from denying the right to vote based on race, color, or previous condition of servitude, aiming to secure Black male suffrage |
| Hiram Revels | first African American to serve in the U.S. Senate (Mississippi, 1870–1871), symbolizing the political gains of Black Americans during Reconstruction |
| Blanche K. Bruce | African American senator from Mississippi (1875–1881) who became the first Black senator to serve a full term, representing the peak of Black political participation during Reconstruction |
| Segregation | practice of separating people by race in public and private institutions, expanded in the post‑Reconstruction South through Jim Crow laws and social customs that legally institutionalized racial inequality |
| Sharecropping | post‑slavery agricultural labor system in which landless farmers, often formerly enslaved, rented small plots in exchange for a share of the crop, creating cycles of debt and economic dependence |
| Minstrel Shows | popular 19th‑century stage performances featuring white performers in blackface caricaturing Black people, reinforcing racist stereotypes and shaping mainstream American culture |
| Compromise of 1877 | informal political deal settling the disputed 1876 presidential election by giving Rutherford B. Hayes the presidency in exchange for withdrawing federal troops from the South, effectively ending Reconstruction |
| Sand Creek Massacre | 1864 attack by U.S. troops on a peaceful Cheyenne and Arapaho village in Colorado Territory, killing mostly women and children and marking one of the most notorious episodes of anti‑Native violence |
| Little Big Horn | 1876 battle in Montana where Lakota, Cheyenne, and Arapaho forces led by Sitting Bull and Crazy Horse defeated U.S. Army troops under George A. Custer, a major Native American victory in the Plains Wars |
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