Just to point out,most every ethnic group has its own caucus as well and keep other euthenics outside.They all claim to be concerned about other groups but the purpose is the make sure that each group represents and holds as many in their groups as possible.When you consider the the Caucasian government held seats far out number each of these groups it sounds discriminatory but the design is to give these groups the ability to stand against racial bias,by the admittance of others the purpose is lost and becomes the same as many general legislation groups.This photo could just as easily be of asian,hispanic,cuban or indian groups.It's what allows these groups a voice in our legislative system