Final answer:
Justice Taney wrongly used the lack of citizenship for Black people as a basis to deny them rights and privileges.
Explanation:
Justice Taney uses the argument that Black people are not citizens to prove that they are not citizens. In his opinion in the Dred Scott v. Sandford case, Taney asserted that enslaved African Americans could not be citizens of the United States, thereby denying them the rights and privileges granted by the Constitution. This flawed logic was central to the court's decision to deny Dred Scott's freedom and reinforced the deeply unjust institution of slavery at that time.
Learn more about Dred Scott v. Sandford case here:
https://brainly.com/question/41672761