it looks like it pretty much did solve itself. There was friction. It passed.

Bussing, voter registration drives and reservations are all quite artificial and politicaly driven. Even pledging allegiance is a mildish form of (3).

ETA: Incidentally, you have throughout been associating multiculturalism with immigration, but minority aborginal populations can be relevant as well. Among other things.

Can you eliminate crime that way?

What has that to do with this discussion?

It is a way of making the point that hoping that problems solve themselves is hardly ever a workable solution to anything.