I have looked Everywhere. It seems minor races are listed nowhere in the any of the XML files. It seems not only can you not Add them, but you cannot modify the exisiting ones, the name of thier star systems, or even thier description in the foreign advisor's screen!

That is, of course, if I'm not missing something blanbantly obvious.

Thank you.

Any text editor will do. All strings for ui are in there, as well as some "not implemented yet" stuff, just get into it...

It should work out though, however simply just change all the minors to your own choise, and you should have the benefit.
BTW, the game seems to "randomly" pick the minors with the lowest ID first...just try in cheatmode the shift-ctrl-D to spawn new ones.
Has anybody else noticed, that by doing this, the newly spawned minor seem to be unable to develop themselfes, just as the initial minor do?, i.e. they don't build ships and I also guess they build no planetary improvements, since I took one planet and no improvements were build

How did you add your minor race? I went into the XML file and looked around, and recoginized the minor races, but I don't see a real difference from the minor races to the major races? Is there a certain category I need to make the new race to be a MINOR race? Thanks for any help.

Try here for a Stardock Modding Guide: Link

It is one of the stickies: Link

Because (afaik) you can't add more. I've only had luck modding existing minors.