Again, this is not the result of some natural, genetic desire to associate solely with one's own race. Rather, it is a result of liberal approaches to education and race that encourage the balkanization of college campuses.
I think I know what you mean. You are talking about all the minority "pride" organizations. But I think the liberals are pandering to an innate tendencies in this case.
There are other examples. Inner city gangs tend to associate by race -- in Los Angeles, there are Hispanic, African-American and Asian gangs, and it isn't because the mayor encourages it.
Sub-Saharan Africa is 99% black, not because few white people have happened to wander there and were not comfortable in the African climate but rather because they have not been successful in competing with the native population. Events in Zimbabwe and South Africa are a good illustration.