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Racism has its roots in tribalism which was evolutionarily adaptive in the past whereas our brains have changed very little when it comes to those urges. There are also other factors at play such as economic prosperity of oneself and the other group , cultural influences, religious, political influences and so forth
As long as you have a "diverse" country you are going to have applied racism in one form or another.
However this does not really answer many important questions. Things like "What is racist?", "What causes certain groups to do worse" and so forth are all up for debate.
I am so glad I am not American
