Separate Entrances

In this picture, there are two different entrances to a building. The entrance that you enter is determined on the color of your skin. The fact that where you were allowed to go was based on the color of your skin is ridiculous. I understand that this was due to the discrimination against black people. I just don't like this because it just doesn't seemed right at all and there is no reason to go to those lengths to make someone feel lesser than another.