There was much prejudice based upon this way of looking at the world. The Europeans and Asians both regarded themselves as superior to the other skin colors. Racism, a non-scientific theory or ideology, was that a particular race was superior or inferior. It argued that in the races that make up the human race, there are deep, biologically determined differences. It also states races should live separately and not intermarry. A supporter of racism is called a racist. These attitudes in turn supported the horrors of African slavery, Apartheid, Segregation and the Jim Crow laws, Nazism and Japanese imperialism.