The problems causes by racial or ethnic disputes are either excuses for wars based on other grounds such as the interests of very affluent private individuals such as businessmen,government officials or Army officers. or misunderstandings or ignorance that have happened coincidentally or on-purpose over time. I think racism and differential treatment on people based on their ethnicity or race is just someone lying to themselves, or being raised in an environment where they are supposed to, genetically there is almost nothing - or we wouldn't be able to easily interbreed. It is a social construct in a large sense.