Answer:
Expansion lead the economic promises and fueled the manifest destiny but it also led to sectional tension over slavery. The north contained a lot of abolitionists while the south was commonly pro-slavery, this increased sectional tension because each side wanted to see their ideals extended into the west.
Yes it is a trustworthy source
The northeast, where factories and cities were
These guys basically plucked from a handful of "sinful wrongdoers" that they believed were to be punished by their own god, and yet took things into their hands. They'd accuse any woman as of being a witch. A servant girl, a sick old lady married to her servant, a homeless begger. And so forth. They played the game telephone and spread lies about anyone and everyone resulting in innocents dying.
