Well I am a member of a multicultural sorority, so yes my chapter and sorority at large is extremely diverse. I attended UofMich where it has a very diverse student body, however, the greek system was not. I believe I read somewhere (I think our school newspaper) that w/in the NPC and IFC, about 1% of the members were minority. It's sad that those groups can't be more diverse, but at the same time, UofM offers a plethora of greek orgs (Asian, Latino/a, Multicultural, Indian)to join. So now, everyone has some place to fit. I'm not saying whether it's right or wrong, I'm just saying w/ all the variety, I think a lot of minorities here just aren't that enthused about the NPC or IFC orgs.
But I do agree with whoever said that it just depends on the campus as to how diverse the chapter is gonna be. In some places, minorities are (and can be) comfortable with joining NPC or IFC orgs, while others don't feel that comfort and want to be with people that they can relate to on a more cultural level. And I think that's a key factor in why there are a lot of campuses where the NPC/IFC orgs don't have a lot of diversity. It's a weird situation b/c on one hand, it can be a problem/concern (the segregation or lack of diversity amongst orgs), but at the same time, I suppose one has to try to look at it from a minority's point of view. I don't know...those are just my thoughts

Hope it made some kind of sense
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A Radiant Lady of
Zeta Sigma Chi Multicultural Sorority, Inc.
"Diversity: Often perpetrated, never initiated"