Missouri Compromise: This was an agreement passed by Congress in 1820 that maintained a balance between slave states and free states by admitting Missouri as a slave state and Maine as a free state.
Compromise of 1850: It was a package of legislation passed by Congress to address issues related to slavery, including California's admission as a free state and the Fugitive Slave Act.
Kansas-Nebraska Act: This act allowed residents in Kansas and Nebraska territories to decide for themselves whether they would allow slavery within their borders through popular sovereignty.