There is a large section of the mediation universe that is very focused on issues of diversity. The following logical models, adopted from Leah Wing 's work at the University of Massachusetts, Amherst, are provided for a model of various options and approaches to the issue of diversity. This is impossible to achieve.
All groups remain unassimilated in the same ratios.
Proportionate voting systems create governments with this composition. See, e.g. the State of Israel. The core culture is transformed into something else and the outside cultures gain equal focus and impact. This model is generally seen by the dominant culture as a full force attack on the social covenant. Bake a chocolate chip cookie without the chips or the salt or the vanilla and you will realize immediately what I mean.