The correct answer is A) slavery might become legal everywhere.
The other options of the question were B) slavery might be banned everywhere. C) formerly enslaved people would move to the North. D) formerly enslaved people would stay in the south.
What many people in the North believed after the Supreme Court ruling in the Scott v. Sandford case was that slavery might become legal everywhere.
The decision of the Supre Court in this Dred Scott v. Sandford case in 1857 represented an important moment in the history of slavery in the United States. The court decided that African American slaves could not be considered citizens of the United States. And if they were not citizens, then, they had no right to file claims asking for their freedom. After this decision, many people in the North started questioning the role of the Court and demanded slavery to end.