What impact did the dred scott decision have on abolishing slavery in the united states?

The Dred Scott Decision became the subject of constitutional and historical debates. The Supreme Court ruled that African Americans could never be citizens of the United States. The slave owners of the South felt the decision of the Supreme Court supported slavery. This dispute over slavery between the North and South led to four years of Civil War. The Confederacy lost and slavery was abolished. 

The answer should be europe