separation.
if you think black people are wonderful and can handle themselves, why not let them live with their own.
And whites can live with their own, and their subgroups.
This doesnt mean that races cant interact, but societies with too much racial diversity have proven to cause racial problems.
if there is a person who has an issue with one group or another enjoying life on their own, id say you need to look at that person's true motives as to WHY he wants that group to be diverse, even when them leaving the majority, or existing peacefully elsewhere poses no threat to them.