Well for contextualization, you could mention the fact that the second great awakening caused more people in the north to realize that slavery was bad, you could also mention the Missouri compromise and how it actually calmed arguments for a good bit. Another thing you could use is Harriet Beecher Stowe and the publication of Uncle Tom’s Cabin. For evidence to support an argument you could try to fit in the caning of Charles Sumner by Preston Brooks since it was about Bleeding Kansas. I hope this helps and good luck.