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| Term | Definition |
|---|---|
| Manifest Destiny | The belief that the U.S. had the right to expand west to the Pacific Ocean. |
| Mexican-American War (1846–1848) | War between the U.S. and Mexico; the U.S. gained land in the Southwest. |
| Treaty of Guadalupe Hidalgo (1848) | Ended the Mexican-American War; gave the U.S. California and other lands. |
| Wilmot Proviso | A proposal to ban slavery in land won from Mexico; it failed but increased tensions. |
| Compromise of 1850 | A deal to ease tensions; California became free, but the Fugitive Slave Law got stronger. |
| Fugitive Slave Act | Required people to return runaway slaves, even from free states. |
| Uncle Tom’s Cabin | A novel by Harriet Beecher Stowe that showed the cruelty of slavery and increased abolition support. |
| Kansas-Nebraska Act (1854) | Let people in those territories vote on slavery; led to violence (“Bleeding Kansas”). |
| Popular Sovereignty | The idea that people in a territory should vote on whether to allow slavery. |
| Dred Scott v. Sandford (1857) | Supreme Court ruled that African Americans weren’t citizens and Congress couldn’t ban slavery in territories. |
| Republican Party | A new party formed in the 1850s to stop the spread of slavery. |
| Abraham Lincoln | Elected in 1860; his election led Southern states to secede. |
| Lincoln-Douglas Debates | A series of debates over slavery during the Illinois Senate race; made Lincoln more well-known. |
| John Brown’s Raid (1859) | An attempt to start a slave rebellion by taking over a U.S. arsenal; failed but scared the South. |
| Election of 1860 | Lincoln won; Southern states began to secede soon after. |
| Secession | When Southern states left the Union after Lincoln’s election. |
| Civil War (1861–1865) | A war between the North (Union) and South (Confederacy) over slavery and states’ rights. |
| Emancipation Proclamation (1863) | Lincoln’s order to free slaves in Confederate states. |
| Gettysburg Address | A short speech by Lincoln about unity, democracy, and honoring the fallen. |
| 13th Amendment | Ended slavery in the United States. |
| Union | The Northern states that fought to preserve the U.S. and end slavery. |
| Confederacy | The Southern states that seceded from the U.S. and supported slavery. |