Final answer:
The Supreme Court's ruling in Dred Scott v. Sandford invalidated the Missouri Compromise and declared that blacks could not be U.S. citizens, denying Congress the power to prohibit slavery in federal territories.
Step-by-step explanation:
As a result of the Supreme Court's ruling in Dred Scott v. Sandford, the Court declared that blacks, either enslaved or free, could not be citizens of the United States.
Consequently, Dred Scott did not have the legal right to sue for his freedom, and the Court held that the federal government had no authority to prohibit slavery in its territories. This effectively invalidated the Missouri Compromise, which had established certain territories as free from slavery.
In the Dred Scott v. Sandford decision, the Supreme Court ruled that blacks did not have federal citizenship and could not bring suit in federal courts.
The Court also stated that Congress had no authority to bar slavery in the territories. This decision had the effect of invalidating the Missouri Compromise, which declared that certain states would be entirely free of slavery.