What did the Supreme Court rule in its 1857 Dred Scott decision?

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The Supreme Court ruled that Dred Scott was not a citizen of the United States and therefore could not sue for his freedom. This decision upheld the institution of slavery and declared that Congress had no power to prohibit slavery in the territories. Additionally, the Court ruled that the Missouri Compromise, which banned slavery in certain territories, was unconstitutional.

What Did the Supreme Court Rule in Its 1857 Dred