In 1857 which decision by the U.S. Supreme Court help to spread slavery to the western territories?

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The Dred Scott v. Sanford decision in 1857 by the U.S. Supreme Court held that African Americans, whether enslaved or free, could not be American citizens and therefore had no standing to sue in federal court. Moreover, the Court ruled that the federal government had no power to regulate slavery in the federal territories acquired after the creation of the United States. This decision effectively allowed slavery to spread into the western territories.

In 1857 Which Decision by the U