Why does the world try to hold back black people?

what has black people done to the world that they are hated so much,black people suffered from slavery already and yet still people always tre to put down blacks.They discriminate against black people all the time.i think this is the reason black men commit so many crimes they retaliate to all the negative feedback they get from society.I think people should treating black people this way because it is not getting us anywhere.....