Final answer:
The Supreme Court case ruled that African Americans could never be citizens, and that Congress could not ban slavery in U.S. territories.
Step-by-step explanation:
The Supreme Court case Dred Scott v. Sandford hastened the Civil War because it ruled that African Americans could never be citizens, and that Congress could not ban slavery in U.S. territories. This decision further deepened the divide between states that supported slavery and those that were against it, ultimately contributing to the outbreak of the Civil War. The ruling was seen as a victory for slave owners and a setback for the abolitionist movement, fueling tensions and animosity between the North and South.
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