Answer:
The debate over free versus slave territories reached a new pitch with the case of Dred Scott. In 1847 Dred Scott sued for his freedom on the grounds that his master had brought him to live in free land. Ten years later his case was decided by the Supreme Court, which handed down the infamous decision that Scott could not sue because he was not a citizen of the United States and that no one of African origin could ever become a citizen.
Step-by-step explanation:
citizen