I think it is 1.3 okkkkkklklklk
What made slavery legal was D. the Bill of Rights, Because amendment 13 officially abolished slavery in the United States and continues to this day.
So D. is your anwser.
Hope this helps. :)
I believe your answer would be B. The Republican Party believes in less government control, as well as lower taxes for everyone, essentially leading to citizens having more investment and money in the future.