This was when there was a line drawn that literally divided the nation between slave and free states.
The Abolition Movement was when Abolitionists tried to convince to people that slavery was wrong and should be stopped.
The book Uncle Tom's Cabin was written to make slaves seem more like other people.
The election that Abraham Lincoln was elected in.
John Brown tried to put guns in the hands of slaves to let them revolt.
This was when South Carolina leaved the union.
The war between the north and the south over slavery.