3. southern states considered the dred scott case a victory because according to this supreme court
decision, the case said that slaves were

It said that slaves were not United States citizens and could not sue in federal courts. Besides, the sentence added that slaves were legal property of the owners and it was protected by the Fifth Amendment. The US Supreme Court decision was a landmark decision that angered abolitionists and helped to mobilize them.  The sentence declared the Missouri Compromise legislation - a compromise between slavery and non-slavery states -  unconstitutional . Beyond the legal nuances of the language it meant that Congress wasn’t empowered to impede the spread of slavery.

Explanation:

hold on ill go look

besides the fact that abraham lincoln abolished slavery, and greatly benefit black people, he had a heavy impact of the definition of what democracy was, and should be.