In the case of Dred Scott v. Sandford, the United States Supreme Court
A) voted unanimously to declare slavery unconstitutional and "barbaric," thus causing the southern states to secede.
B) ruled that all adult African-American men had a right to vote under the Constitution.
C) outlawed segregation laws which separated blacks and whites in all public places.
D) ruled that a black man, slave or free, was "chattel," and upheld slavery itself as constitutional.
E) for the first time placed a geographic limit on the expansion of slavery, banning it west of the Mississippi River.
Answer: D