Southerners in Congress won passage of a Gag Rule that blocked discussion of antislavery petitions. John Quincy Adams unsuccessfully fought for its repeal.
Explanation:
The Southerners who represented their states in the United States Congress were ultimately successful in passing the Gag Rule which ceased bringing antislavery petitions to the surface for any discussion. John Adams, who was a staunch believer of the freedom of slaves tried for a long time for the dismissal of this rule.
