Which primary source document could a historian understand why the civil war started?

From this passage, it is clear that president jackson believes the second bank of the united states

In at least two paragraphs, discuss the differences between the principles of republicanism and democracy. explain whether you think the united states is more of a republic or a democracy. refer to at least one example from the constitution. (10 points)

What was the effect of the industrial revolution on the working class ?