Why did the Dred Scott decision alarm northerners?

A. The Dred Scott decision declared the Missouri Compromise unconstitutional and ruled that slaves were property.

B. The Dred Scott decision allowed African Americans living in the North to be sold as property to plantation owners.

C. The Dred Scott decision gave a Missouri slave the right to sue for freedom because he had moved to a free state.

D. The Dred Scott decision ruled that, while slaves were property, their descendents could sue in court for their freedom.

Righ choice: A. The Dred Scott decision declared the Missouri Compromise unconstitutional and ruled that slaves were property.

Explanation:

The Dred Scott sentence stated that black slaves were not US citizens and could not sue American citizens in court. Because the slave Dred Scott had lived in a free state before, he was not entitled to get freedom from his current owner, the judges said. The Missouri Compromise of 1820 struck a balance between slavery states and free states, keeping a delicate balance in the Union. It was declared unconstitutional. The sentence is the worst and most infamous decision ever reached by the US Supreme Court. It was repealed by the passing of the 14th Amendment by Congress in 1868.

your answer is A. The Dred Scott decision declared the Missouri Compromise unconstitutional and ruled that slaves were property