Why do multicultural GLOs/organizations exist?

[SapphireSphinx9]

I think why a few of us are a little uneasy about our organizations being called "historically white" (and I can't speak for everyone) is because some of our GLO's were founded upon welcoming all races, creeds, religions, etc. into our membership. I understand that a lot of the NPC's (or what people are calling the "historically white" sororities) were founded for Caucasians... but like I said, not all of them were. And so blanketing the WHOLE conference like that is disrespectful, because it's as though you don't want to learn about how different our organizations really are.