I would think that it is C but I'm not that sure so get more answers.
Answer:Nullification crisis, in U.S. history, confrontation between the state of South Carolina ... The doctrine of nullification had been advocated by Thomas Jefferson and James ... John C. Calhoun furthered the nullification doctrine in his South Carolina ... of the legislature) to take an oath of support for the ordinance, and threatened contrast
Explanation:
They were signing a petition to establish the 'Columbia Territory'.
Answer:
The slave code kept enslaved people frightened and powerless
1850.................................... I think
