What was the impact of Dred Scott v. Sanford (1857)?

• A. It denied citizenship and constitutional rights to African Americans in certain contexts
• B. It established the right to vote for women
• C. It created the Monroe Doctrine
• D. It ended slavery in the border states

Answer: (A)

The key idea being tested is how a Supreme Court decision shaped who could claim constitutional rights in the United States. The Dred Scott ruling held that African Americans, whether enslaved or free, were not citizens and thus could not sue in federal courts. It also said Congress had no authority to ban slavery in the territories, treating enslaved people as property under the Constitution. This combination meant that African Americans were denied basic legal standing and protections in many contexts, and it reinforced the institution of slavery while deepening sectional tensions that helped lead to the Civil War. This choice best captures that impact. The other options describe policies or outcomes unrelated to this decision, such as voting rights for women or the Monroe Doctrine, or they misstate the effect by implying slavery ended in certain areas.