Use the passage to answer the question.
What does the author mean in saying that popular sovereignty "undermined the Missouri compromise”?
(1 point)
Responses
It maintained the division of free and slave states.
It maintained the division of free and slave states.
It expanded slavery to the Northern free states.
It expanded slavery to the Northern free states.
It forced slaves who had escaped to be returned to a slave state.
It forced slaves who had escaped to be returned to a slave state.
It reopened debate over the border between free and slave states.
It reopened debate over the border between free and slave states.