Final answer:
The Dred Scott v. Sandford case ruled that slaves are considered property, with the court stating that Black people could not be U.S. citizens and the Missouri Compromise was unconstitutional.
Step-by-step explanation:
The Supreme Court case that ruled slaves are property, regardless of their location, is known as the Dred Scott v. Sandford decision. In this case, the Supreme Court ruled that Dred Scott, an enslaved person who had lived in free territories, was not free and that enslaved people were considered property.
The Court also stated that Black people, whether enslaved or free, could not be considered citizens of the United States and therefore had no standing to sue in federal court.
Additionally, Chief Justice Taney's opinion declared the Missouri Compromise unconstitutional, thus allowing slave owners to take their slaves into any territory. The decision increased the division between the northern and southern states, contributing to the tensions that led up to the American Civil War.