| A | B |
| Republican Party | political party that united against the spread of slavery |
| James Buchanan | democratic president in 1856 |
| John C. Fremont | republican candidate in 1856 |
| Dred Scott | slave who sued for freedom in 1846 but lost |
| Roger B. Taney | Supreme Court chief justice who ruled against Dred Scott |
| Abraham Lincoln | republican who ran for Illinois senator in 1858 |
| Lincoln-Douglas Debates | series of debates in Illinois that helped settle the senatorial election in 1858 |
| Freeport Doctrine | police would enforce voters' decision if it contradicted the Supreme Court's decision |