Dred Scott was a slave that fought for his rights when he saw that things weren't right. He slave owner had moved areas from a slave state into a free territory, which Dred Scott became free man. Soon, his slave owner wanted him back when he moved back to a slave state. Dred wanted to sue his owner since he was free in that area and his owner couldn't have him back. The court then agreed with the owner saying that Dred Scott couldn't be a citizen, resulting in him have no control over his rights. Although Scott had many valid points on his claim, they denied all of it and this lead to tensions between the states.
North: They disagreed with the treatment of Dred Scott and believed he should be a free man
South: They agreed with the treatment of Dred Scott and saw it as very reasonable.