In addition to voting for secession, what else did South Carolina propose at its state convention held following the election of 1860?

It called for a confederacy of the Southern states.

Explanation:

Following the 1869 election, where Abraham Lincon won, a state convention was held in South Carolina, where they established their secession from the United States and declared themselves a free nation. This was due to disputes over the legality of slavery between the northern states and the southern states.

After enacting various laws and establishing their constitution as an independent nation, they offered various southern states to unite into a confederation to fight the northern states.

I hope this information can help you.

answer; /// the above statement is (