In 1834, Dred Scott was a slave in the state of Missour, which was a slave state. His master took him into linois, a free state, and then to Wisconsin, a free teritory, and then back to Missouri. Scott was suing for his freedom based on what grounds ? A. This lawsuit was after the Emancipation Proclamation, and slavery was illegal. B. Based on popular sovereignty, Missouri was to become a free state the next year C. He had been a slave for 10 years; therefore, by law he should have been freed. D. He felit his residence in the free areas had made him a free man.​