| A | B |
| Union | states that remained loyal to the United States |
| Compromise of 1850 | allowed California to be admitted to the Union as a free state |
| States’ rights | the idea that people of a state can choose the laws that best fit their needs |
| secede | Break away from the Union. South Carolina was the first to secede. |
| Harriet Tubman | helped slaves escape on the Underground Railroad |
| Kansas-Nebraska Act | allowed people in certain areas to determine whether or not their territory would allow slavery |
| Confederacy | Made up of the states that broke away from the Union |
| free state | A state in which slavery was illegal, such as in California |
| Fugitive Slave Law | Law that said slaves who escaped to the North had to be returned to their owners. |
| Missouri Compromise | Preserved the balance between free and slave states. Admitted Missouri (slave state) & Maine (free) |
| slave state | A state in which slavery was allowed |