What was the Dred Scott v. Sandford Supreme Court decision of 1857, and why was it historically significant?
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A
It ruled that Congress could abolish slavery in any U.S. territory it chose
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B
It declared that African Americans were not citizens and that Congress had no power to ban slavery in territories
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C
It granted freedom to enslaved people who had lived in free states for a period of time
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D
It ruled that the Missouri Compromise was fully constitutional and must be upheld