Women can vote now and work in areas that before where considered only for men. African-Americans can now go to same schools as white people and eat at the same restaurants
The decision effectively stated that states could not be 'free' or a 'slave state' because its unconstitutional for states to exclude slave ownership in territories. The decision also stated that slaves were not citizens, thus could not sue in federal court. The best answer is that slaves were not citizens.
Is this to help people feel better and be happy?