How did the Dred Scott case affect the division of free and slave states?

i got you ;)

Explanation:

They ruled that African Americans, whether they were slaves or had ancestors who were slaves, had no legal view in court. They felt that the Missouri Compromise was unconstitutional. In the eyes of the court, Dred Scott had no legal right to request his freedom

if that doesnt help then this aswell

The Dred Scott Decision outraged abolitionists, who saw the Supreme Court's ruling as a way to stop debate about slavery in the territories. The divide between North and South over slavery grew and culminated in the secession of southern states from the Union and the creation of the Confederate States of America

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.