Compromise of 1850: A set of laws passed by Congress to address issues related to slavery in newly acquired territories from Mexico, including California's admission as a free state.
Kansas-Nebraska Act: An act that allowed settlers in Kansas and Nebraska territories to decide whether or not they would allow slavery based on popular sovereignty.
Compromise of 1877: An informal agreement that resolved the disputed presidential election of 1876. It marked the end of Reconstruction and resulted in the withdrawal of federal troops from Southern states.