Why is racism occuring?

One view is that racism occurs because people are not accepting that there are people in the world that don't have the same same skin color as them. Black or Chinese or Indian, etc still have the same body and personnality, but all that is different is the skin colour. Another view is that racism, bad as it is, has happened for historical reasons. One example is when white nations captured and enslaved black people in Africa. The "slaves" were then moved to Another Country where they were viewed as being at the lowest rung in the social ladder. The "stigma" of slavery was regrettedly maintained by some groups of white people even after the blacks had been given freedom, the right to vote and other civil rights, for example in the United States. This is the true cause of racism in a historical sense.