[BlahBoy3]

I go to what could be considered a fairly diverse high school, and in my experience, your comment is pretty much right on the money- especially the second part. Sure, there may not be legal barriers per say, but take one look at the cafeteria and you'll realize that there's a clear racial divide (Hispanics only hanging out with other Hispanics, etc.). Like you, I don't really know how to change this, short of just calling everyone out (which would probably only breed more tension).

[Jtsummers]

You don't call anyone out. You just wait one to two generations. Once the community is mixed, physically, social mixing and diversity will occur. By keeping them physically separated you impede social integration.