Server Groups?

How does wow determine which servers and/or characters to put into a zone instance together? I noticed that I am usually in zones with tons of ally and very few horde. Is there a set of fixed servers that are linked together? If so, how do I see the grouping?

Try here:

‘https ://www.warcrafttavern.com/population/classic/’

There are other sites as well, you can Google. I have no idea if that is current or not. I just Googled it.

Also, with cross realm stuff it doesn’t matter any longer really.

I have an Alliance toon on a server that originally was Alliance heavy. Now all I see are Horde cross realming. I rarely see Alliance.

Or maybe I’m cross realming… Who knows? lol