| Term | Definition |
| sectionalism | the placing of the interests of one's own country ahead of the interests of the nation as a whole |
| popular sovereignty | The concept that a States people should vote whether to be a slave state or Free |
| Wilmot Proviso | bill that outlawed slavery in any territory that the United States might aquire from the War with Mexico |
| Free-Soil Party | party that supported Wilmot Proviso |
| Henry Clay | United States politician responsible for the Missouri Compromise between free and slave states (1777-1852) |
| Daniel Webster | senator of Massachusetts said Clay's compromises were necessary to save the Union |
| Compromise of 1850 | henry clay's proposed agreement that allowed california to enter the union as a free state and divided the rest of the mexican cession into 2 territories where slavery would be decided by popular sovereignty |
| Fugitive Slave Act | a law passed in 1850 which made it a crime to help runaway slaves and allowed for the arrest of escaped slaves in areas where slavery was illegal, it also required their return to slaveholders |
| Anthony Burns | a fugitive slave from Virginia who was arrested and jailed in Boston |
| Uncle Tom's Cabin | a novel published by Harriet Beecher Stowe in 1852 which portrayed slavery as brutal and immoral |
| Harriet Beecher Stowe | famous author, wrote Uncle Tom's Cabin, first american novel to make real people of African-Americans, made the people care |