After the scott v. sandford ruling, many people in the north believed that slavery might become legal everywhere. slavery might be banned everywhere. formerly enslaved people would move to the north. formerly enslaved people would stay in the south.

The correct option is slavery might become legal everywhere.
Many people in the North were angry at the decision and thought it meant slavery would spread.The ruling resulted in the abolitionist movement growing stronger and strengthened the Republican Party, which won the election.

Race, for example, the chinese exclusion act