when a state decides that it no longer wants to be part of the Union and leaves.
a system that allows everyone to get paid if they work. People can leave their boss if they want to, and they have the opportunity to get higher in the system (i.e. become the boss).
the belief that slavery should be stopped immediately everywhere with no compromise, even if violence is necessary to achieve that.
the idea that the people in a given state should vote as to wether there should be slavery or not.
the network of people who help slaves to escape to freedom. they would hide them in their house, and transport them to the next "station". Then the "conductor" of that house would do the same.