> is ban further amendments I'm not sure it even does that. Reading the passage you quoted, it seems like it only bars amendments that give Congress the power

> is ban further amendments I'm not sure it even does that. Reading the passage you quoted, it seems like it only bars amendments that give Congress the power to interfere with state slavery laws. But the amendment that freed the slaves didn't give Congress that power, it just freed the slaves itself. It sounds like The Corwin Amendment only covers attempts to abolish slavery that wouldn't go through the process of ratification by the states.