Answer:
Answer:
He feared that slavery could spread into the free-states.
The Dred Scott decision was a United States Supreme Court case in which a slave demanded his freedom because he had been in two free states before returning back to Missouri. The Supreme Court decision declared that as a slave Dred Scott was not considered a U.S. citizen. As a non-citizen, he had no right to sue in a Federal Court.
Lincoln reacted with disgust to the ruling and publicly speak out against it.
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