The correct answer is:
Lack of citizenship for free or enslaved African Americans.
In the Dred Scott Decision, the Supreme Court had to answer whether Congress had the power to prohibit slavery in the territories.
Chief Justice Roger B. Taney expressed the position of the court's majority, a judicial defense of the most extreme proslavery view. He stated that Dred Scott, who had sued to gain his freedom, had no right in federal court because neither slaves nor free blacks were considered citizens of the United States.