Judicial activism influences decisions made by the individual justices when deciding cases heard by the Court because judges are more likely to be influenced by the needs of the public and strike down laws and policies as unconstitutional.
Lowering the taxes in the states
The main argument in favor or slavery as an institution during this time in the US was that black people could not take care of themselves and that they would fall into chaos if allowed to go free. Another argument was that many were already enslaved in Africa and were living better lives in the US.
Answer:
White people in america didn´t see them as humans, so that allowed them to use them as slaves. This view of them being non-human allowed them to use them as tools and sell them like animals.