In the years leading up to the 1860 presidential election, which of the following included a provision that Black people were not US citizens?

The Dred Scott decision of 1857 declared that people of African descent were not citizens of the United States and therefore could not bring a case in federal court. The Kansas-Nebraska Act addressed whether territories could permit slavery; it did not establish this citizenship rule. So the correct choice is the Dred Scott decision.

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