Question

jubilant secessionists jeered when the convention finally collapsed and agreed to try again in baltimore six weeks later.
source: building the american republic, volume 2
in this sentence, secessionists means:
people who want to break free from a larger group
people who favor a philosophy of progress and reform
people who are deprived of the rights of citizenship
people who are faithful to a country, party, or cause

Explanation:

The root - word "secede" means to withdraw formally from an organization, union, or country. So secessionists are those who want to break free from a larger group.

Answer:

people who want to break free from a larger group