I have revised some of your words replaced with bold words in your paragraph.
Racism is the judgement of people's skin color, whether it be black, white, tan, or yellow. Racism is the wall between different skin tones that we ourselves put up to try and "defend our rights" or so we think we are? Racism is the key to world wars and wars with ourselves. Racism is the separation from this world, which is the one of many problems keeping the world apart and distanced.
Great job on your response!