Yes, if all marriages were mixed marriages, racial discrimination would disappear. However, discrimination would still be with us. Humans are naturally motivated to categorize people and objects. This is normal cognitive behavior. But discrimination goes beyond that. Research shows that the attitudes of people who discriminate are a reflection of a complex set of factors including their history, socio-cultural practices, economic forces, sociological trends and the influence of community and family beliefs.One out of every eight people, are marrying outside their race. Genetic diversity gives the human population resistance to germs. Humans are very inbred, because of a genetic bottleneck, 80 thousand years ago.
If we can get the races all mixed up, people with high intelligence, will be more likely to thrive, and the people with low intelligence won't know about it, because the races will be all mixed up. Let's say, for argument's sake, that whites and blacks have 100 intelligence in common, and blacks have 50 intelligence genes that whites don't have, and whites have 75 intelligence genes that blacks don't have. If a black person and a white person then have a baby, it will have between 100 and 225 intelligence genes. Good genes spread faster then bad genes, through the population, because they are more fit to survive.
Reverse psychology may the best strategy, so we may want to tell young people not the marry outside their race.
In short, people will always be guilty of discrimination. If it's not race, it will sex orientation, religion, national origin, innate abilities or disabilities or just about anything that people have little control over that flags them as being different. Our parents teach us to be wary of what is different because things that are different are often not well understood and what is not understood can be dangerous. The only way to end all discrimination is make everybody the same, not exactly the kind of world most of us would want to live in
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