What were the three key issues the US Supreme Court had to face during the Dred Scott case?

Sandford, legal case in which the U.S. Supreme Court on March 6, 1857, ruled (7–2) that a slave (Dred Scott) who had resided in a free state and territory (where slavery was prohibited) was not thereby entitled to his freedom; that African Americans were not and could never be citizens of the United States; and that.

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Explanation:

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it's lit.

it should be a. song dynasty’s civil service examination system created an administrative bureaucracy manned by the landed aristocracy.